Hi Bella and alone48,
Yes, my renters knew the situation and no "sleepover rule" coming into the house.
Since I am Catholic I do not support premarital sex (no tomatoes please) I know that is not a popular stance in our culture today. I have my convictions and though I am not forcing them on others (or even judging) who live with me I am just reinforcing my beliefs under my own roof. If others do not agree then they don't move in.
Originally, when I first took over the lease 5 years ago, there was no such rule has to whether or not roommates could have guests or not. In the past, roommates would have guys trapping through the apartment during the week and on weekends and it was uncomfortable for me and the others roommates to hear the sex noises, wake up to strange guys making coffee in our kitchen and taking long showers when the other roommates needed to use the bathrooms. The male guests also seemed to take up part-time residence in the apartment and found my living room couch to be a great hang out most nights of the week. This was a privacy issue that affected the entire house. At one point, one roommate suggested another roommate's boyfriend start paying rent too because he slept at our apartment almost every night of the week. With four females, hopefully, you can see the potential conflict men sleeping over can create.
A couple of years ago my roommate, who was also my friend, suggested that we create the no men sleepover rule, if people want to spend time with their boyfriends they then were going to have to go to their boyfriends place at night. This worked beautifully and most roommates, who move in, really appreciate the level of privacy it creates as well as the feeling of safety and the host of problems that are eliminated by this house rule.
If people don't like the rule then they just don't have to rent from me.
Also, I am not the landlord in a technical sense, I am the master tenant renting from the landlord (who lives in another city) the roommates are the subtenants and by my city laws have to respect me, the master tenant as the law, so to speak, if they don't like the living situation I provide then they have to move out.
My landlord loves me as his master tenant because normally I get a long well with roomers, treating them fairly and because I am responsible, quiet and clean.
Hope that gives some clarity.
Lise