@Paris28
I'm assuming that when you don't have guest(s), the guest bedroom is used by you (or your daughter). To some extent I understand your discomfort BUT you are renting a private room on Airbnb. When an ABB guest is staying in your guest bedroom, they will probably end up doing every imaginable thing a person can do in a private bedroom. They will probably fart, drool, snore, have sex (with someone in person or on the phone or alone), eat chinese takeout, watch TV in bed, wet the bed, and whatnot.....maybe sleep a bit too. Sure..... some people will not feel comfortable doing some things when they are a guest in someone's home. Others won't care and will feel/act right at home.
If you want to continue to host but are really uncomfortable about couples having sex in your shared home private bedroom listing I would think that the best option would be to accept only single guests (make your listing a single occupancy room). Also, if it is just you and your daughter in your home (no males) then you could also state you accept female guests only. Of course, these solutions aren't perfect and there will always be a few that fall in between the cracks.......but if you screen well enough and let guests know your expectations IN ADVANCE, it could help you find the type of guests you want to host. Good luck~
And I'm sure a good washing of the sheets will be enough......you really don't need to throw them out 🙂 What do you think hotels do with sheets that are dirty from guests having a romp??