I misused the term semen retention, I was using the term in relation to solo cultivation not dual. I already know all the potential risks given in link 2 and have done none of it. Qigong and neigong is pointless if you don't learn sexual cultivation first, otherwise you'll just lose energy through sexual means. Semen retention can be practiced by simple avoiding or strongly diminishing sexual activity, if it was that easy I wouldn't be asking for help. You might be able to hold out for a week or two but eventually you'll succumb to it. Besides even if you reach the 3 month mark it becomes dangerous because at that time you would have built up a tremendouse amount of sexual energy and if you ejacualte at that point, there is a serious risk of that energy becoming stuck in your head causing a multitude of problems both pyhsical and mental.