My DDs- now 31 and 26 never had sleepovers where boys were invited. My son had a request- I said no- the Mom called me and I said no to her. He wasn't happy, but his friends didn't treat him any different.
His friends could stay over, but the girls went home at midnight (and we were right there in the next room- popping in unexpectedly all evening).
I always told my kids they could blame me- I was going to keep them from "sticky" situations where they were afraid to tell their friends they didn't want to go along.