Just canvassing opinions. I have three teenagers DD1 19 (20 next month), DS 17 (upper 6th, 18 in July) and DD2, just turned 16.
Older two, both in steady(ish) relationships.
DD1 bf coming to stay tonight. He is 23. Although they have only been going out for a couple of months I really don't feel that, at their ages, I can object to them sharing a room. I know DD1 is sensible, she has the implant, and both have had sexual health check ups so am prepared for them to share. This is going to cause problems, though, when DS finds out. His gf is 16, (lower sixth) and when she came to stay in the Christmas hols I insisted on separate rooms (also requested by gf's mother) Caused me a bit of a merry dance when they closeted themselves in DS's room in the evenings and had to go up and quietly request that they repair to their respective beds so I could retire too. (I know there was no guarantee they would stay there, but felt I would have done everything reasonable wrt gf's mother's request; she couldn't expect me to sleep on the landing, surely?!)
The thing is, since H left home, DS has seen himself as the "man of the house" and will bitterly resent the different treatment of older sister, especially as his relationship is longer lived. How do I handle this?