As usual on Mumsnet posters are taking very extreme positions on this issue (no pun intended) 😆
There is a middle way between not particularly wanting your teenage and young adult dc bringing bfs and gfs in to a family home to sleep over and teenagers shagging in car parks!
I am close to my DDs and I know they certainly did not do the latter! It’s not mandatory you know. They possibly took advantage of our absences occasionally, which is not exactly a surprise.
We weren’t very comfortable with our DDs bringing young men in to the family home, staying in their bedrooms, because we think that behaviour is more appropriate at university, and we have younger siblings to consider and tbh dh and I didnt feel we were particularly harmed by our parents who had the same rules. In fact, on the contrary, on one or two occasions I was grateful that home was a safe space. Mainly though it just felt rather awkward, especially when we didn’t know some of these young men very well!
We did however invite their friends of both sexes to stay over regularly. But never exclusively and not in the same bedrooms.
We were lucky enough to be able to accommodate them separately in our home if they needed to stay the night because of distances or we included one or two bfs we had got to know better on family holidays but at the same time we didn’t exactly encourage staying in our DD’s bedrooms either.
Things are a bit different of course once they move on to have stable long-term relationships and we feel we know the bfs enough to be comfortable around them and we are sure that they treat our DDs well.
Also, selfish though this may sound. another factor is that dh and I are older, we have both work and caring responsibilities, and we have limited time and energy to invest in hosting a bf who an adult dc is only going to be seeing for a couple of months.