Absolutely. I love art.
Would you have sex in your neighbor's back yard? Maybe they're out of town, maybe they're asleep, who knows!
I've done this already. After a barbecue and a few too many drinks, I ended up falling asleep in a deck chair; my boyfriend at the time woke me up with some light groping, and we ended up having a quickie there and then. Broke the deck chair, too.

Would you have sex with your neighbours watching?