It's only recently did tattoos go from underground shame to acceptance by most of the public. Probably started around the 90s, and from there the popularity of them took off.
Before that, usually a person with a tattoo was someone mixed up in bad dealings you wanted to avoid.
But since general perception has changed, they've gotten a lot more accepted and more people get them in places that are a lot more visible (people who got them usually had them hidden under clothing). In more conservative circles, this is still the norm and most hide it under clothing for work.
The real problem with tattoos is they're permanent, and I can't really tell you anything I liked 10 years ago I still like today, which means "forever" is kind of reserved for something I'm not quite sure what yet. Sure you can get tattoos removed, but that's often far more painful and far less effective than not getting it in the first place.
Then there's the body issue - well, a Navy sailor who get a ship tattooed on their body puts on a few pounds and the tattoo they got when they were young and fit looks gross and distorted once they are in their 40s and has a beer belly. Or as someone wrote, "A ship with a bulbous bow, now has only grown more bulbous over the years".
It's just something I haven't gotten because "forever" is a long time. And I'm sure tattoo artists have lots of stories of girlfriends now enemies they had to alter.