Not (that I remember) with gay/bi mates but, like you, I have a straight mate who talks endlessly about cocks. Although he's British I know that he (and his three older brothers) are all circumcised, I know his full masturbation habits, his medical history (about which he's completely open), his relationships with previous girlfriends and his now wife, his brief experience as an escort when single. He loves talking about foreskins, circumcision, wanking, sex. He's very open about everything.
I don't know whether it does anything for him but I frequently end up walking away, trying to hide a raging hard-on!