Yes, you need to tell. That type of behavior is wrong and dangerous. Potentially dangerous to you. Your parents need to be told. You will be doing the right thing.
duh... that's disgusting and innapropriate
i would tell your dad especially since hes leaving semen on your bed, thats just plain wrong
Tell your dad immediately!
You need to tell your dad right now. Its YOUR room, not his and he has no purpose of doing so in Your room
There must be a reason his room isn't suitable for this activity, but if it's causing a problem for you, just tell him he has to stop and be done with it.