I may just be getting old, but I think tattoos, especially having a lot of them or very large and visible ones, can show short-sightedness and immaturity. I also don’t find them attractive, and generally they’re going to look their best shortly after getting them when the person is likely in their best shape. When skin starts sagging and the tattoo starts fading, it looks bad. They can also be expensive

That doesn’t make them sinful, of course.
They may be regarded as only “semi-permanent” now that there are ways to remove them, but it’s my understanding that they are rather painful (and expensive, again) to remove. I don’t think it’s a bad thing that posters on this thread have admitted that they don’t think tattoos aren’t attractive and would make them think twice about dating someone.
I wanted a tattoo when I was in college. Lots of girls were getting - as they call them - “tramp stamps” and butterflies on the hip, etc. 10 years later, I’m glad I never did. I’ve heard they can be “addicting” and I’ve got a fair number of friends and relatives who have to be rather creative about their attire and makeup application for job interviews, etc. It’s nice that I can just use completely temporary methods of self-expression like clothing and hairstyle and not have to worry that someone might see something silly I did when I was 20 and get the wrong idea about me. Almost everyone I know - even the really secular folks - wouldn’t get them now, but they’re still stuck with them until they have the money to get them removed.
Some of these folks are lovely and great friends. I just think they made a poor decision to mark their bodies this way, because I think the desire for the marking wanes in the years after and there’s not much that can be done about it. There’s lots of ways to “express yourself” without it.