Her response was freakishly similar to my own mum's reaction when she found out. It went along the line of "Well, you're at that age. Don't be an idiot."
No seriously that's exactly how it should go. When they're of age and they've been with that person for a good amount of time hey Just be Smart and Be Safe!
That ending...Parents in Hentai can be so understanding sometimes.
It's to the point where not only does she wholeheartedly support you, she even provides condoms...
Slightly embarrassing? Yep. Avoiding stupid hang ups? Double yep.