In the 70s, I used to lay on my stomach on the thick shag carpet in our basement wearing my PJs. I'd grind and hump the floor as it felt so good. I started doing that when I was 7 or 8. I continued for years until I started ejaculating. When I first stated to cum, I'd do the same thing but nude in my bed. Then I discovered jerking off with my hand, which was a completely new adventure.
Being a super flexible, athletic guy (I used to do gymnastics among other sports) I realized I could self-suck which added another element to my repertoire. Other times I'd put some lube in a condom and sandwich my cock between a folded pillow and thrust away.
Now I pretty much just jerk off while watching porn. I enjoy many different types of porn but mostly homemade stuff. I even jerk off to the home porn my wife and I have shot. lol
As much as I like to masturbate, which I could easily do to completion 10 times a day, I find myself edging more these days and saving a big load for my wife. Otherwise I probably wouldn't be interested in having sex with her.
If it feels good, do it!