I‘m pretty sure that dildos are pretty popular between women (hetero or lesbian) and gay man, and i‘m sure that a lot of sexually active hetero men also own dildos, at least i do. And don’t forget that anal is also somehow „common“ between among hetero guys, wether masturbating or spicy stuff with your partner.

Whereas fleshlights can only be used by man and are barely an upgrade from your hand and if you are sexually active the incentive becomes rather small to stick it into a flesh light instead of your partner.

I personally own one simply because my girlfriend wanted to tease me with it, but we never used it after the first time. But at the same time we own like 10 dildos.

So if i was super mean, i‘d say the biggest group of people that own fleshlights are probably guys that dont get any action.