Sexual Edging - Is There Longterm Effects?

I’ve been practicing more and more on my sexual performance and lasting during intercourse. (I’m a healthy male, late 30’s)

It’s not been easy for me but it’s been a long journey.

I’ve also introduced toys in the bed as close as the real thing for practice to help when I’m not active with someone.

Ive gotten to a point now where after 3-4hrs of sexual activity I don’t allow myself to finish/come at all and call it a night. (I can keep going but I stop due to sheer tiredness & work in the morning)

My question is medically is this going to hurt me in some way internally if I kept this exercise up say 2-3 times a week?

If men do not allow themselves to come/finish at all does the body drain the seminal glands & after how many hours ?

Are there any negative side effects ?

TIA