And why does Viagra work only if the man is sexually stimulated?

You must be sexually stimulated for it to work.

discipline7 - as a way to sexually stimulate themselves.

The only way one would be able to see the epaulettes is when the male becomes stressed or sexually stimulated.

On the one hand she sexually stimulated him, so he felt strongly but wickedly attracted to her.

I don't need to be sexually stimulated when I hear about the economy and the war in Iraq.

Autoeroticism is the practice of becoming sexually stimulated through internal stimuli.