Does anyone think this is annoying or am I wrong?

I have a 19 year old son. He has a serious girlfriend who I like very much. My son and girlfriend are both very good people. They are pleasant to be around, friendly and outgoing. Here is the thing, they are at my house 24/7. They are always lounging on the couch or cooking in my kitchen. My husband and I feel like we are roommates to them and we pay the mortgage!! They constantly are lounging on the couch(often on top of each other? she is constanly draped all over my son. It is driving me crazy because when I get home from work they are here, every weekend they are here. My house is not very big and I find myself squirreled away in my room just to have "me" time. I have recently told my son he HAS to go to her house at least three days a week and when I get home on those three day they are not to be here. My son is saying I am pushing him away and I feel guilty. Am I wrong asking for my space or is my son being immature? What can I do to help him see my point???? It is cause a lot of friction between my husband and me

Put the internet to work for you. via Personal Recipe 2629979