Bro, Dirk, Dave, Damara, Meenah, Porrim, Latula, Cronus, Mindfang, Dualscar, and the Condess all have genital piercings. Some more sensitive than others.
In order of sensitivity:
(least to most)Bro
Dirk
Condess
Meenah
Mindfang
Damara
Dualscar
Cronus
Latula
Porrim
Dave
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Homestuck Sexcannons
बेतरतीबThe title says it all. Sexual Headcanons from the Webcomic, Homestuck.