[betterThanTexas]

> By the fourth century it became standard to forbid marriage because was believed that previously permitted marriage was only for individuals who remained celibate within the marriage.

On the other hand, de-facto marriages (say, a live-in servant woman the priest treated like a wife, including having sex with her) were overlooked by the catholic church on continental Europe well into the high middle ages.

[alricb]

If by "the high middle ages" you mean "2025", then you are right. Priests in de-facto marriages are still super common.

[ImJamal]

Those are not real marriages according to the Church. Any sexual relation in that situation would be fornication and as such a single.