The thing is, there are plenty of girls out there who would enjoy DT. I think the problem is that 1) it's not a huge part of pop culture, and 2) it's "too complex" to be able to dance to. Number 2 is a bit of a nitpick, but I truly think number 1 is a huge reason for it. If someone isn't out in the open and it's more unknown than what you hear on the radio, then people dismiss it. People that aren't music fanboys, people that mainly listen to the radio, people that just like certain songs and not the artists specifically, these types of people make up a HUGE portion of the world. These people don't think too deeply about music, so something that doesn't grab their attention quickly is a "skip" for them.
Also, DT is not a very social band. It doesn't really make you fist pump and go crazy, it doesn't really belong in parties, it doesn't belong in the gym while you work out, the entire vibe of the band is introverted. It's "on another level" as I would say, and unfortunately most people don't want music "on another level", they just want to dance, or mosh, or do whatever they do. DT is the kind of band that you dissect, that leaves a lasting impression. It's not easy listening in the slightest. Plus, a lot of their songs are super long. I think all of these points is good enough reason to see why a lot of the women that you meet would not like them. I'm just using women as an example, because that's what the topic is about, but I have heard the same from men too.
But I do think that if DT was way more out there in the open, you'd be surprised about how many people get into them. They are just a bit too below the radar, and the average music listener doesn't want to (or care to) dig through anything to find music. They like the songs they like and that's it.
But hey, I think you CAN dance to DT. There has never been prog dancing, but if there can be prog music, then I think prog dancing can be a thing. Enigma Machine is a very sexy song (in my opinion) so I don't think it would be too hard to make a dance for it. The Dance of Eternity, Blind Faith, Through Her Eyes (slow dance) and Octavarium would make some epic dances if someone actually took the time out to make one. Seriously, if someone uploaded a video to youtube making an epic dance of a DT song, if done right, it would go viral. DT can be danced to, it's just that its listeners don't care to make the time to make a dance for something that isn't made for dancing. Heck, I can't even dance anyway, so you wouldn't catch me making one.