[slightly NSFW] Issue with housemates- any ideas on how to rectify?

I live with a couple, who recently moved in to our place. Of my other two housemates (5 of us altogether) one is away traveling and the other is after moving out.

The couple have taken to bringing their bedroom activities in the common areas. It makes me very uncomfortable and I've begun to feel like Karen in my own home. I've given them feedback and asked them not to do it, nor smoke (standard ciggies or weed) in the common areas but to no avail. In fact it's left things really frosty between us and I'm stressed out.

I know the obvious solution is move out but I think I'd end up homeless. My budget won't stretch that far and anything in budget is either really bad living situation or it's gone because of the huge demand. I'm just a gal who wants to be able to make her dinner without walking in on this kinda thing in the kitchen 😭

Any ways to get this couple to cop on?