Since it has been a while since a woman posted a technique....
For me there is the physicality of masturbation. This ranges from clit rubbing, to fucking myself raw with something, but it can also be just squeezing my thighs together..(something I learned to do when I was 14).
There is also the mental aspect. Sometimes I fantasize about being seduced, other times being raped. (Sadly, I have not had sex at all yet... so this is all in my mind) I love the thought of being fingered by a dirty old man... someone who is desperate for a girl's attentions.
But my favourite technique at the moment is definitely masturbating in public places. Shop changing rooms are a favourite, with public toilets hot on their heels. I have jilled off on a train a few times and also, on one memorable and totally lust-filled occassion, I was masturbated to orgasm on a train by a total stranger. The train was packed and we were pressed up against the door with me right in the corner. My mound was pressing against the back of her hand when the train rocked. She didn't ask me, but after about ten minutes of this she just slipped her hand between the buttons of my coat and up under my skirt. No one could see, and I found myself opening my legs a little to let her get at me. She pressed my knickers up inside me and then wormed her finger under them to my clit. A few minutes later, I was cumming hard and long. I also wet up BIG time. I also got to touch her.
The dirtiest thing I do is...um... well, I like to wet myself. It's naughty and feels utterly delicious. I sit on the lawn and just let it go into my knickers really slowly. I've done this in fields, while walking and even on a bus once. It always makes me horny as all hell. I think I would like someone to do that on me while they jilled me off.