I met Penny who is now my wife 8 years ago when we were both twenty two and had just joined a graduate training scheme of a major company. We married 5 years ago, bought a house to renovate on the edge of a small town in the south of England. Sexually Penny, whilst not a virgin was quite inexperienced, though with time we progressed from missionary, to her on top, doggy style, which she loves and almost always climaxes. It took a year or two to get her to try oral sex, but with practise she proved to be an adept cock sucker. She insisted that I mustn't cum in her mouth, well accidents happen, I shot my load. I of course apologised, thinking she'd refuse to do it again so was pleasantly surprised when a few days later, she told me she'd actually quite liked the taste and didn't object if I came in her mouth again. All in all satisfactory sex lives, shagging 2 or 3 times a week, as good as the majority of married couples I guess and probably better than many. Of course like many men I'd fantasised seeing my wife being fucked by another man, but had certainly never dared suggest it to her. She'd have been horrified just at the suggestion, or so I believed. She wouldn't have had any problem finding guys, she's 5' 6”, slim from regular fitness training and a healthy diet, a size 10, natural redhead, 32dd tits which she thinks are to big, but I disagree. She normally keeps her pussy trimmed, except when we go on our summer holiday when about a month before she starts shaving. As I say I’d have liked to have seen her having sex with other men but thought the chances of her doing so were close to zero. At least until a visit to my home town about 200 miles from where we live, which changed things, though I didn't realise it at the time. It was summer last year, a couple of weeks before we were due to go on holiday, when an elderly great aunt of mine died. I hardly knew her but our presence at the funeral was expected by my parents. Their house was full with other relatives so Penny and I were staying in a Lodge nearby for 2 nights. Arrive Thursday, funeral Friday then another day visiting grandparents etc. It was the Friday night, funeral out of the way and we'd gone out for a meal, then afterwards to some of my old haunts, a couple of bars and pubs for a few drinks. It was getting on for 11pm, we'd had more to drink than usual but weren't smashed, when I recognised a girl, Geraldine, who I'd gone out with for a few months, between finishing at University and leaving to start my job. She'd hardly changed, though now about 28 or 29 she was still wearing mini skirts, she certainly had the legs for it and had a couple of guys in tow, nothing new there either. I saw her looking over at me several times, which I pretended not to notice, rather hoping she wouldn't come over. I had memories of her, what a slut she'd been and what a bitch, she could be, real trouble. Inevitably over she came, I had no choice but to introduce her as a friend, “More than a friend” she commented. Penny gave me a look. I mentioned we were married, probably giving her a pleading look not to say anything about out past. No so suck luck, she continued, talking about people we knew, places we'd been, leaving no doubt we'd been shagging. She turned to leave, I gave a silent sigh of relief, but she turned, “Do you ever see anything of Gareth and Ed” she asked. I hastily replied that I didn't, hoping that would be it. “That's a shame. Remember the times the four of us used to go out and how we always ended up at that car park? Bet you don't do that any more” she laughed looking at Penny before turning to rejoin the two guys. The bitch. Penny looked at me, eyebrows raised questioningly. I laughed it off, hoping with the drink, she'd forget, suggesting we finish our drinks, pointing out the time. We both needed the loo, I naturally finished first, waiting for Penny outside the pub for around 5 minutes. Walking back to the Lodge, Penny mentioned how pretty Geraldine was and how short her skirt had been. Having had a few I replied that she'd always worn skirts like that, in fact that was one of the longer ones I'd seen her in. Nothing much else was said, other than a comment she made about me liking girls in short skirts, and me jokingly (or more like hopefully) saying she should wear one, she'd got the legs for it which is true. Back at the Lodge she showered, I watched her when she insisted on shaving her pussy, having started a week or so previously ready for our holidays, my prick erect by the time she'd finished and I showered. She was laid on the bed, playing with herself when I went into the bedroom. I joined her, kissing, sucking her nipples, rubbing her clit. She rolled me on to my back, licking and sucking my knob before climbing on top, guiding it into her hole. She sat there, hands on my chest, slowly rocking, rubbing her clit against me. A nice slow gentle fuck until she stopped. “Geraldine was in the ladies when we left” Oh shit I thought. “She told me why you all went to that car park. To watch people fuck” I started thrusting into her, hoping to distract her, she started to move with me but wasn't deterred. “She said it was called Dogging. What happened” I had to say something, hoping she be to shocked to ask more, telling her that it just involved watching people having sex in their cars. She went quiet about it, rubbing her clit as we both neared climax, moving in rhythm until we both came. She climbed off, disappeared off into the bathroom and I did the man thing of rolling over and going to sleep, thinking I'd fielded her questions and she'd have forgotten about it by the morning. She didn't mention it again until we were in the car ready to drive home. It was sixish, a 200 mile drive, we got to the end of the road and she asked if we could visit the car park Geraldine had mentioned. It wasn't out of our way so I drove there, fairly quiet at that time and certainly no dogging. She quickly lost interest and we drove home, nothing more being said for a number of days. We'd had an early night and she began asking about dogging again, asking what Geraldine did. I told her sometimes she'd played with herself or tossed blokes off through the window. Rather than the expected eruption of outrage and disgust she seemed to find the details exciting, asking about what she wore. Mini skirts or dresses, stockings, sometimes no underwear, I described some of the tarty outfits. She wanted to know what else Geraldine used to do. “Did she give them blow jobs?” she wanted to know. “Sometimes” I told her. I gave her a few more more details including the fact that she liked blokes to wank and cum on her. It was the week before we went on holiday that she asked the question which I'd been expecting, “Did she have sex with strangers?” “Yes” I replied “Did you watch her?” “Sometimes” worried where this was leading, “Did you enjoy it?” “Yes” I reluctantly admitted, worried at her reaction and the question I'd expected her to ask next, if I'd fucked Geraldine and been watched. It didn't come. Instead she said “What a Slut” Not with disgust. She sounded almost wistful, though I thought I was mistaken. We went on holiday to Spain. On the the first day we went to the beach, Penny was wearing a beach dress and a wide brimmed hat because of her fair skin. I carried the sun umbrella, erecting it, back to her. I could hardly believe my eyes when I turned she had removed the dress and all she was wearing under it was a tiny String. Her bum naked, the thin strip of material between her legs, barely covering her gash, a triangle of almost see through material covering her shaved mound. She sat topless, smoothing Factor 50 on, seeming to spend a lot of time rubbing it on her tits, and thighs, opening her legs, particularly when men passed. I had to roll on my front to hide my erection, whilst she seemed to be flaunting her practically naked body at every passing male, lapping up the obvious attention. We were both turned on and at her suggestion had sex on the balcony where we could easily have been seen, fucking like rabbits every night of the holiday. She mentioned Geraldine perhaps half a dozen times, usually before we had sex. More incredibly, she surprised me, at night, wearing a mini skirt and skimpy crop top or short dresses. I only found out on the last night she'd either gone without panties every night or had removed them whilst we were out and had been sitting, in the bars, restaurants and street cafés, with her legs open exposing her pussy to passing men, without my noticing. Testing herself, trying to discover why Geraldine did it, what the thrill was, see if she had the nerve to behave like her, she explained when I discovered what she'd been doing. She was evasive when I asked if she'd enjoyed it. Reticent to admit to herself or me her feelings. The signs had been there, topless, wearing just the string on the beach, flaunting herself at guys, the short skirts and dresses, exposing her cunt to passing men. I was just on the wrong wavelength, not really believing that it was any more than her being relaxed on holiday, lightening up, more uninhibited than in the past, no more than her experimenting. It wasn't until the weekend after we returned that she explicitly asked what I thought of her exposing herself on holiday. “Horny as hell of course. You're turning into another Geraldine” I joked. She didn't say anything immediately, then looking me directly in the eye she said, “That's exactly what I want to be. I want to be like her and be fucked by other men. I want you to take me dogging” I think I just sat there mouth hanging open, unsure what to say. “Can we go. I've been reading all about it on the web. I've found some places to try” she continued excitedly. I'd imagined it, watching my wife being fucked, but never expected it to happen. “When do you want to go?” “Tonight” she answered, bending over, kissing me passionately, extracting my stiff cock from my jeans, working her way down, undoing my shirt. She sucked me off, swallowing my spunk, then with a filthy grin said “Hopefully I'll be getting plenty more like that tonight” How could I refuse! We'll tell you what happened in Part 2 if you want us to continue.