WEIRD as all fukk. And just gonna add also sexist, cause we know damn well he wouldn't feel the same about his son at 18.
I started fukking at 18 and my hymen didn't tear until the 3rd time I had sex. Anal and oral sex exist, so her hymen being intact doesn't mean she's not active.
If he was really proactive about her health he would be more focused on making sure she is on a good birth control that she likes, you can't keep your kids away from sex forever, and being strict and weird like this is probably gonna have the opposite effect. When parents try to hard to suppress their children's sexuality the child usually rebels.
An 18 year old woman enjoying sex is not a bad thing. Nor is it a blight on anyone's parenting. Having an 18 year old child who fukks doesn't make you a failure of a parent, its makes you literally like every other parent of a teenager.