I answered “other” because most of the time I’m not thinking of anyone. I’m a lot like Hello Again in this regard. I’m content to close my eyes and get absorbed in the umm, task at hand. 
Female.
Orgasms are much more intense for us than for you guys. I’ve been in the unique position of being able to compare the two and it’s like night and day. The drive to keep doing it is from testosterone.
Woman here. Apparently I am weird, but I don’t fantasize or have mental images when I’m touching myself and never have (I’ve been doing this for a long time). I have to wipe my mind of everything to focus on orgasm. I have perfected my technique and can rub one out in 2 minutes or so.
Mental imagery isn’t unheard of during non-sexy times. Always faceless bodies with no identity, or my partner. For the 19 years before him I don’t ever remember fantasizing about an individual.
Also, any sexual fantasies I have are utterly vanilla (as is my sex-life really). Even a shade of humiliation, ‘dirtyness’, discomfort or pain is a huge turn-off for me (which is why you can’t pay me to watch most porn).
The thought that I’ve probably featured in someone’s fantasies just because they think I’m cute really grosses me out. I suppose that’s part of why I’m so hesitant to ever fantasize about any individual I haven’t had sex with (even though I know it’s totally harmless and most people probably wouldn’t be creeped out even if they knew).
When I’m in love, I think of that person.
When I’m not, half the time random women will creep into my head. The other half, I think of beautiful, abstract imagery… mountains, meadows, nebulae, sunlight. As the sensation intensifies, the imagery usually fades to a field of black punctuated by roving blobs of color – like the inside of your eyelids, only faster and more vivid.
And as it subsides, I usually think of a previous SO.
I think you might have epilepsy brah.
I fantasise about having a threesome with Marge Simpson and Lois Griffen.
I once found relief imagining doing it with Wilma Flintstone but thought that that was a bit perverted so I haven’t done it again.
Quite possibly. Maybe I’m doing it wrong but I don’t lose my shit and collapse in a quivering heap when I take a wank.
It still feels good though. Maybe you have sexlexia.
I think about w/e I’m watching usually. If not watching anything, usually old flames or current lust-bundles. Nothing out of the ordinary.