Do you ever get an involuntary erection in a car?

No, all of my car boners are quite voluntary.

"I'm female" - this. but it doesn't mean we don't get aroused in cars too.

think about it... you have two tons of machinery vibrating under your lap. It's not surprising sometimes it gets you turned on

I've always gotten turned on from cars that shake or vibrate a lot. Especially if it belongs to a woman. I don't know why but its been like that my whole life, I can't change it. Weird

Not me personally, but my husband often tells a story about his involuntary boners that always happened when he got a ride to school in his dad's diesel engine truck.

No. I don't have a penis. Blah.

Yeah. Good thing my horn is broken.

only with my umbrella with the dodgy button