Hey baby?All Aboard The PAIN TRAIN!!
Excuse me! Body inspector! Looks like you passed with flying colours (that one has to be delivered in a british accent).
Are you a galaxy? Because you look like a bunch of beautiful stars all put together.
This one never works:
(Pirate accent) Prepare to be boarded!
At a biology conference:
Hey. Do you wanna draw up some Punnet Squares to see what our kids would look like?
You could also be really blunt and bring out this old gem that got me slapped in the face:
Excuse me. I find you very beautiful. I would like to have sex with you, get married, raise a family in a nice suburban home, and grow old with you. That cool?