can u bcome a nun after you've had sex?

Answer 1

Yes.

Religious sisters (nuns), religious brothers (monks), and priests take vows of chastity (not virginity) promising to never have sex (again).

With love in Christ.

Answer 2

When you take Holy Orders, you typically are promising to commit to "poverty, chastity, and obedience". While the Church is kinda anti-sex (outside of marriage), they're not going to reject a legitimate vocation because you weren't celibate before you found the calling. And, of course, if you've got a late vocation (say, after being widowed), it's no sweat.

Answer 3

Yes.