I like women, generally. One in particular. But not many of us got here becasue a man kept his pants on. And marriage is not sure-fire protection against bad stuff happening either.
No, there is no sure-fire protection.
We could all stay in bed to avoid bad things happening to us, and you know, bad things could happen there.
However, the best protection men have against being exploited by devious women is postponing sex until marriage.
After that they can take their pants off all they want! And make many more FReepers.
Sure, they could still get burned. But for example only 3-4% of abortions in this country are performed on married women.
So you have much much better odds.