The male physique

[kumu]

the chest first then the face and hair then the butt, back, and legs

[Byron]

Wow, reading all that is quite a turn-on but I am going to say biceps because of a little theory that if the upper arm is impressive (and that can be checked in T shirts as well as speedos) then all will follow suit (if you will forgive the pun).

PS: for LC to check butts (middle one has crack): http://tapthatguy.com/post/7492159633