i think that skylark brings up an interesting point about some people waiting until they are married.
before i met my husband, i certainly espoused this notion. but, then i met my now-husband, and because it was many years before i was going to marry him (parent-school thing), i figured that it was pretty mcuh all the same and i didn't need to wait for a specific date.
that being said, i did have some hang ups prior to this that needed to be worked through. i was probably supressed and repressed and oppressed and had pressed pants, skirts, and shirts, but neverthess, this indicates that i had some emotional things to work through.
by working through them, i was able to have a happy sex life. If an individual wants to wait until marriage--in general this is a good thing. If they are waiting until marriage because their suppressed or repressed or drycleaned, with the belief that marriage will somehow 'fix' this problem, then they're in for a bit of a surprise (i'd say). these things need to be worked out before one has sex--no matter whether that's within or without marriage.
i know that wasnt' skylark's point. but it's an area that i think is worth mentioning. I do think it's a good idea to wait until marriage if it's something that you value or think is right for you.
And, i'd also like to point out that just because someone is sexually active (before or outside of marriage) doesn't mean that they're at all healthy in a emotional or psychological way in regards to their sexual activities or sexuality. I know a number of people who do not behave in their best interest sexually, even though they are sexually active.
ah, people are diverse.