Girls how to turn you on?

Undersid
Lovely girls! I was wondering that if a girls extremely revealing clothes and nonchalantly touches her boobs(in a classroom) a guy gets a hard on instantly.

Conversely is there any method by a which a guy can turn on a girl, without interaction? Just like girls can.

If I purposely erect my penis and rub it nonchalantly (acting as if I am just rubbing my pubic area because my underwear is irritating me for example) will it help? Or even if move my erect penis up and down so that the girl is looking at it but I am looking somewhere else will it help?

Please give me good practical answers. And remember I have to turn on girls without talking to them!
Girls how to turn you on?
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