i like the lights on or dimly lit. if i'm going to have sex, it's usually going to be with someone i find sexually attractive, and doggone it, i want to be able to see their sexy self! :P
seriously though, i find the male body super sexy, and i like looking at it. plus i like seeing the look on the other person's face during all of it. i am a little self-conscious about my body, but i've learned with practice to get over that enough because i enjoy it much more with visual stimulus.