Apart from the manipulation thing, marrying someone you didn't have sex with before is going blind into the unknown. Would you advise to marry someone you don't know well? Wouldn't that be silly and risky?

She could be frigid. Or low-libido. Or highly inhibited. Or sex-averse. Or icky. Or having sexual preferences way different from the man's. Or even a lesbian. You could not know without real experience.

If I make a promise for life, I wanna be damn sure I know who I'm committing to - in every regard.

Sex (or the lack of it) is among the top three reasons spouses are miserable or divorcing.