Just reading Science News, and I discovered that it takes almost 90 days for a man to manufacture a sperm cell.

That's pretty interesting.

May well have something to do with why the Golden Flower and everyone says 100 days of retention is a watermark, why Ron says that there is a 100 day wall, and may be why my experience of retention gets harder after 100 days.

Takes 90 days to put together an Armada!

-Yoda

100 days is called the small achievement. The big achievement is 300.

Does your balls ever start to ache?

Well, then I've acheived smally a few times!

Im not into retention, but I do believe we must replace what sexual energy we lost during sex so that our sexual energy reserves remain topped up. I practice the deer exercise twice a day from Stephen Changs book "The complete System of Self Healing" and I must say my sexual energy is very high, so I can ejaculate 2 times a day with no ill effects in terms of energy loss. I also do Crane breathing and Turtle breathing for Chi cultivation and to strength the Internal organs and Nervous System. I highly recommend his book, he has a very different aprroach compared to Winn.

Daniel