I went 2 weeks when we decided to try for a baby. I abstained for 2 weeks as she got to the middle of her monthly cycle. I was 29, wife was 25, we were used to fucking every day. anyway we did, as we were told, it would help in giving us a boy child. this is from old Jewish books, Talmuud???. It worked we got a boy.
I know sperm is not stored in the testicles but it seemed like my big balls got bigger if I did not have sex on a regular basis, and after 2 weeks, they were large and saggin. after a week, the wife noticed they were abnormally larger. I remember when it was time, and we finally had sex, she came, and I came and blew my monster load. she said she could tell I had shot a big load. I remember her using a pillow to prop herself up, so it would not run out. a little while later I shot another load, and still another.
I would only abstain for this reason. my balls were getting too large after 2 weeks, maybe it's imagination.