It seems that the more hard the erection gets, the harder and more painful it is to push it down away from my body. I have yet to have sex, but I can't imagine using different positions, like doggy style.
this position requires the penis to be at angle of 90 proportionally to the body, which i think might be a little hard.
any tips?
and anyway, what are the best positions for a high-angled (flat against the belly) penis?

thanks