I have been doing kegel exercises for a long time now! I'm pretty confidence that my PC muscle is strong. I just don't know how to USE them during SEX?
So do I want to squeeze them really hard during intercourse WHEN I feel I'm about to
Or
Do I want to STOP, pull out and squeeze right before I'm going to
Or
Is it better to constantly squeeze and relax throughout the process of intercourse?
It is different for every person, I personally like to do this kind of thing occasionally during intercourse, or right before the big O, but some people are different.
I read your question this morning, and I have been trying to remember how I used my PC muscles during intercourse... I haven't had coitus on a regular basis in years. It might have been clenching at the base of the penis and holding while I pulled back.
Try different stuff along with the slow tempo of partner's stroking.
Practice makes perfect! :D