Jawbone - I have a 3d Primal Pictures anatomy Atlas and I have found some great pictures - but I don’t know if it is legal to publish them here without permission. I can send You as a private files I guess. There is some wise info there but no pictures of contractions. That’s why I’m still looking for them.
Joseph75: You are right - there is a reason for reverse kegel. When You do them, You increase the internal pressure in Your pelvis - that causes more blood to flow into Your penis eventually and the “speed” of semen flow is higher. That’s why You can notice semi erection - but NOT full erection. It’s not possible to achieve it this way.
It’s like the difference with blowing a balloon with lips open wide and lips nearly closed. You can feel pressure in both cases but only the second one will allow You to create one, big, tightened balloon.
That’s why it is advised to do 2 kegels: normal and reverse. They help each other but in different situations.