I am not a parent so what I have to offer comes from theory or psychology.
Since summer break started for my daughter, these two think that they need to be together 24/7 with the exception of going home to sleep. What this has turned in to though is the boyfriend being at our house every single day from at least 2-3 pm until curfew which is 11 pm for the summer. While I don't have a problem with "visitors", I have had some issues with him being here so much. He doesn't cause any trouble while he's here and is respectful of our rules however he's eating us out of house and home and he makes a disaster of my daughters usually clean room.
I'll start with your daughter's room. IMO, this is all about Boundaries and Boundary setting. You and your husband need to decided exactly what you want or will tolerate, tell everyone involved about your BOUNDARIES and then make a plan to ENFORCE those Boundaries or Rules, etc. Most folks fail at the "enforcing" stage so the kids or other Offenders just don't take your Rules seriously! IT'S YOUR HOME!!!
It's also been very annoying to my husband because he says the boyfriend is here entirely too much.
But does he ever tell the boy when to be there and when not to be there? If so, does he ever ENFORCE his policy???
I've talked to my daughter about it, set a few different rules but then we go back to him being here every day again.
So then why would your kid or the boyfriend take you seriously?
My question to you guys is, how do you handle this with your teenagers?
You establish your rules of boundaries and BACK THEM UP!
What do you allow as far as boyfriends go?
Anything you want - IT'S YOUR HOME!!!
And are any of you in a similar situation with a home schooled child that doesn't have any friends and wants to spend all of their free time with a boyfriend/girlfriend?
Home schooled or not, kids need to understand and comply with RESPONSIBILITIES and BOUNDARIES! Home schooling needs to include lessons on accepting certain boundaries and limits in life such as not eating up all of your food, making a mess in your kid's room, coming to your home at or during such and such hours and many other normal, social standards that another kid would probably be learning at Public School. You are NOT HELPING your daughter or her boyfriend by allowing them to be in YOUR HOME without any limits or boundaries and responsibilities.