AirBnB has nothing to do with your property once they are booked.
If you don't want anyone having guests or affairs while in your propety you need to disclose that up front but good luck with that!
But why should you care what anyone does behind closed doors if they are not damaging your property?
It's not your business who people have sex with and I'm sure they'd not appreciate you making it public here.
Do you not copulate with your partner while renting a room? Would you appcreciate it if the host/hotel posts comments about it?
And I'll be sure not to rent from you while in Spain!