Name changed for this! DS1 (middle child) age 19 is away from home at university. Came back on Friday. He has a long standing girlfriend who is at uni but lives with her parents quite near us. I don’t know her parents at all. They have met DS a few times but the girlfriend is at our house a lot whenever DS is not at uni.
On Sunday my other two kids (DD age 22) and DS2 age 15) complained they could hear DS1 and girlfriend “having sex” (my DS2’s words).
I was asleep and don’t especially care but agree not ideal for DD or DS1 to hear. DD’s room is adjacent to his. DS2 only heard when he left his own room to use the toilet (ie from hallway).
Also concerned about the girlfriend’s parents - they are from another culture - and they may not approve - maybe we are too laid back (he is an adult).