This is almost always required for masturbation, no matter how the men deny it. Masturbation in the photo is quite a decent occupation. And we can also ask for a photo of the legs, they also masturbate very sweetly ^ _ ^
Imagine a man likes a girl, he is a healthy sexually mature male, it excites him and there is nothing wrong with this desire. Each probably has its own meaning, if the partner is adequate, then he will not show anyone, and if you are afraid to send a photo without a face, this is just an element of flirting.