Three reasons, going from the most to the least subjective:
How it looks. I just plain like the hairless look. I know this is very subjective and some (maybe many) will disagree. And I can fully understand this as I find very hairy guys sexy. I like the extremes, very hairy or hairless.
How it make me feel about my nudity. I enjoy being nude and I enjoy having others see me nude. Any SYD member should understand this. Being hairless is a way to take nudity one step further. It's being as nude as possible.
How it feels. This is by far the least subjective as it feels great. And to have an intimate encounter with another hairless person is dynamite. The ideal encounter is to meet up, shave each other's intimate parts, then have sex. Try it and see.
Not so great is how it feels when the hair begins to grow out and body grooming is high maintenance. That's why I went with the permanent solution and had everything from my neck down permanently removed with a lasor.
For what it's worth, we gay men started the hairless look in the 1980s. Now forty years it's gone totally mainstream. As you have observed, porn stars, both gay and straight, almost always do at least some grooming and many go hairless.
--------------------------------------- added after 3 minutes
I just went to your page and saw your stunning bush. It's really hot and I can understand your reluctance to shave. and regrowth could be a serious problem.