Can

A bit cold at first, but you can love him as you get to know him. He shares everything with the people he loves, so it might hurt him if you betray him. He's also one of the people who can have sex for almost the longest time in the universe and gives his partner an incredible experience. Also, if he's in a relationship with someone, he never upsets that person. He just tries to make her happy.
PS:He finds blondes incredibly attractive.

Einstein had found relativity of time when he saw how long Can had sex with his partner.