The (Parents) Talk

My boyfriend's parents wants me and him to house-sit for them while they're gone for ths weekend... but my parents dont even know we've sleeping together. Actually, they don't know I've ever slept with anyone.

So I'm seeing them on Monday and need to ask them if I can stay with him over the weekend. My parents are pretty cool so I doubt they'll have a problem, I just don't know how to deal with this awkward situation. How do you talk to your parents about a sexual relationship? How do I get over how awkward the whole thing is?