Discretion was my mother's religion:
"Don't advertise yourself as being sexual, don't do it unless you really love them, use protection no matter what, and be a Lady."
I wasn't raised Christian, I was raised Baha'i, which had a mildly conservative bend on sexuality ... sex is sacred and to be shared between loving adults, preferably within marriage. To a dramatic teenager this meant the same thing as the Christian dogma, so it took me until I was seventeen to allow myself to just be kissed (I still almost threw him across the room). When I finally began making out and finding out how wonderful it all felt and nothing bad happened ... my guilt was easily thrown by the wayside.
However, my mother's 'discretion laws' had stuck with me, which I don't mind as much (no guilt, just common sense). The only problem I have is the 'don't advertise yourself' one because I am a verbal exhibitionist ... if that makes any sense ... and well, nobody really wants to hear about fat people getting laid. So that's the societal part coming into it.