im 25 and discretion would be totally upto the woman. if she didnt want anyone to know what was going on id respect her wishes.
my friends know i am a member here, i think one of my married friends joined up after i told him about it actually. i dont really care if people know what i get upto or wether they think its right or wrong. its my life and ill live it how i please. so im not really discrete with what i do, but would be if it was asked.
i also dont really feel the need to brag. but boys will be boys and i guess if you dont ask him to be discrete then yeah, he will tell all his mates what he's been upto!