Penis is for scientific lectures, dick is normal speech & Cock is for lewd talks.
Thank you for coming to my ted talk.
@vriska That's fair, Most of the time I never use it because that's just not a common thing I use when I talk about dick.
However whenever I've talked to women they seem to use that word when they're very intensely talking lewd about what they want me to do to them.
Outside of that context I most never hear that word.
@Mr_NutterButter I really do think it's just been ruined for me by total association with all the weird old guys online who say it