Don't go for the L-word straight away. It sounds creepy, trust me. Just ask him over or out to dinner and see what happens. Really, unless he's a total jerk, if he's not interested he'll put you down gently; if he IS intersted he'll know you are too. And if he's doing things like putting his ass on you... he's interested. No fear, man. Go for it and have a great time.
If you're still too nervous-- do you have any friends who are couples (gay or straight?) If so, arrange a "double date" and just ask him if he wants to go out with you and your friends. Just my two cents Best of luck to you.