Funny, missed this thread when it first came around (I was in Spain, I think).
Yes, my Thai family definitely started acting differently after I got married--even though ktsp and I had been having sex for years before that, we still had to sleep in "different" rooms when we were home visiting my mom (mostly due to grandma/uncle living with us, not my mom--she didn't really care, after she got over the initial shock of my not being a virgin). The older women in the family joke with me about dirty stuff all the time now, which is funny because they just could not before--even though I would have been fine with it. My dad also makes jokes about sex more often now, though he started doing that when I was dating ktsp and figured out that I was having sex. I don't think he has cared particularly much... after all, I was 24 when I lost my virginity.
I think for me, the big sexual taboo that I broke was not having sex... it was masturbation. Since I was an evangelical for most of my teen and college years, it never occurred to me to masturbate--it was one of those things that I just kept a mental distance from, since I felt that it was a distraction from the pursuit holiness (yes, yes, say what you will--but I believed it whole-heartedly at the time).
Finally, when I was about 22, I let myself start thinking about masturbation and sex after a friend brought up the topic. As Will said, that decision went along with my slow walk away from religion--and I haven't looked back since.
