Thank you all for the lovely replies,i wasn't sure what to expect by posting my little confession,however i now feel a little bit more brave about being more explicit,i certainly don't see myself as a swinger really,but i suppose that i still have needs. Derek fulfilled them very well.Do most men have penises like that? It was/is about eight inches long from it's base to it's big angry looking purple head. At first i would only "wank" it for him a little,until he got excited and big spurts of his stuff came out.That was when he talked me into letting him rub it between my bosoms.I never really had a varied sex life before,although it was satisfactory, Derek was very interested in such things though.Eventually i started sucking his thing for him,and he would do the same,letting his tongue enter my vagina,sometimes he used to tickle my bottom hole with his tongue...I thought this was shocking and dirty,but it felt very nice too.I never dreamed then that he'd actually be able to put his large penis into my backside too. I was a bit reluctant the first time we made love,but the sensations he gave me were incredible, indescribable pleasure,and i did climax. I suppose that after that i was just prepared to let him have his pleasure as he wished.And that was how he cajouled me into accepting his manhood in my backside.It was a very exciting sensation i thought..He was so big and my bottom hole is so small.But he always made sure i was nice and relaxed before he put it in. My bottom hole is actually tingling a little bit as i write,and i have butterflies in my tummy, as i remember the tickly sensation as he rubbed the big helmet shaped tip of his penis over my small back enterance.