I politely point out I’ve got a lodger and it’s not a big flat one bathroom (and wfh and furlough) so we give each other notice if we have people round.
So if I was dating someone they might come round for lunch after we’ve been on a few dates, give everyone privacy?
and I get “oh why can’t you just sneak me in NOW!” 
It’s not even about the sex - it’s the lack of respect for someone else’s home/practical living situation?
I’d be financially a lot worse off if my lodger left and having someone reliable and stable is very helpful -
I’ve been unwell recovering from a serious accident for the last year so just having someone around to help me open jars and get food has been helpful!
But then I get some guy who has sent me three flirtatious texts demanding I prioritise the needs of his penis and ego 
I should ask if we can go fuck on his parents sofa when they’re asleep upstairs if he wants me that much.