If you have teens you should know that if your child is going to have sex when they are at your house when you are there is probably the last place you need to be super concerned.
I have allowed this at my house and probably two times at a bf's house of dd who I knew parents very well. The teens don't sleep in the same room and the parents who were responsible slept very little that night. The lack of sleep is the main reason for parents to forbid it. If you live in a rural area and the teens are going to an event that runs very late, sometimes this is the practical thing. Remember, there are many ways for your kids to do the wrong thing so you need to talk and talk and not allow things in your home in front of you that you aren't ok with.
I have allowed this at my house and probably two times at a bf's house of dd who I knew parents very well. The teens don't sleep in the same room and the parents who were responsible slept very little that night. The lack of sleep is the main reason for parents to forbid it. If you live in a rural area and the teens are going to an event that runs very late, sometimes this is the practical thing. Remember, there are many ways for your kids to do the wrong thing so you need to talk and talk and not allow things in your home in front of you that you aren't ok with.