Watching porn of it? It's a little boring unless they use some toys... and orgasm.
In real life? I dunno, never actually experienced it... but It'd probably be very hot :D
It's very hot. There is nothing like it. There is a mysteriously unique intimacy about it. For me I think it's the lack of inhibition or trying to please someone else and just being natural and enjoying the pleasure their bodies give them.
For me, it's not the masturbation that makes it hot. It's the fact that I didn't expect these people to do these kinds of stuff. I mean, if I watch a pornstar finger herself, it'll be 'meh' but when you catch one of your hot librarian-looking friends do it...
If there was a video of a girl masturbating or another video of a girl getting dicked down I'd go for the video of the girl getting pile-drived every time. Girls masturbating isn't a turn on.
(+++ is a positive point, --- is a negative point)
+++ I like seeing girls in pleasure
--- I would be more convinced the girl was in pleasure if they didn't have to do all the work themselves (ie more pleasure from another sexual partner)
+++ Shows the girl enjoys sexual pleasure and masturbation (ie in some certain situations you can't tell if the girl is in pleasure or enjoying sex, but if they are masturbating they have to enjoy it... right?)
--- Makes the girl seem lonely
I mean, I guess it's hot, but I'd rather much enjoy just seeing a girl receiving cunnilingus from another girl/guy to be honest.
When it comes to pleasure, your own mind and body knows what turns you on most. So seeing a woman take advantage of that and divulge herself in full body pleasure is just an amazing sight to behold.