Is sex better if you wait 'till you're married?
My intuition says "no, at least not necessarily." And I've heard assertions of 'yes' and of 'no'--a little of both have come from Christians. But nobody really has the ability to say yes or no, because nobody is really capable of losing their virginity twice. Nobody has the capability of trying married sex both (a) having had sex before, and (b) not having had sex before. It's actually logically impossible to pull off.
A close second, hypothetically, would be this:
(1) Get some consenting volunteers to run an experiment.
(2) Have a way of inducing amnesia which is guaranteed to extend to past sexual experiences.
(3) Have lost whatever part of your conscience it is that would have prevented you from carrying out this experiment.
Now in seriousness, this question is, of course, largely irrelevant for Christians who take it seriously to be a command to wait--who cares if it's better or even worse in terms of pleasure, if it is commanded? But I still found it kind of a funny little thing that despite the bold assertions of yes and no, it is practically impossible to get a reliable answer.