One thing does it every single time: contagious erections. If I'm naked with another person and they get visibly aroused, I will get an erection. The other person could have a penis or a vulva. Obviously, if the person has a penis, it'll happen more easily and quickly. If they have a vulva and I notice they have a clit boner, my penis may not get rock hard but it will grow and get pretty stiff to the point no one would look at it and not think I was getting an erection. Something that gives me unintentional erections often, but not every single time, is taking a shower with someone else. I think it's the proximity of a shower. And depending on who the other person is, if I notice they're really taking a good look at my penis, I'll get erect. In both cases, I'm referring to people who aren't a sexual partner/girlfriend. If it's a girlfriend, I only get erect if we're having sex. Never just from casual nudity in front of each other. And the erections I get in the two situations I described above are largely what I call "nervous erections," meaning those things will give me the intrusive thought of getting an erection and basically make it happen because of the mental battle over trying not to focus on it happening. And mind you, I don't give a fuck who sees me get an erection. I don't think they imply sexual arousal in the way people always assume. It's only because of the inherent overwhelming force of intrusive thoughts. So, if the intrusive thought is, "gee, am I going to get an erection in front of this person?" Then, yeah, I'm probably going to get an erection in front that person.
I've walked in on a number of guys rubbing one out in the gym shower, public bathrooms, and even in their cars in parking lots. Of the eight I had interrupted I was able to finish them off with my mouth. It was so hot.
You know I love those little tits of yours and I’m guessing you have a trimmed little landing strip…. Maybe prove me wrong ??!