One thing that bothers me (in a typically non-sexual setting) is nipple protrusion. My nipples are already thick and the length of an eraser tip at 'rest' and unstimulated. They poke out as if aroused. I have had a number of people make comments (sexual innuendo) when I walk into a room, whether work, a store or visiting someone's home. Most were in a joking tone others not so much. Once some guy said he had the urge to 'tune the radio."
Usually I ignore them, joke when I can, or have used cloth pads to hide the evidence. It's mostly embarrassing when I have to give a presentation in front of my work colleagues, or at a meeting. I note the eyes of a couple of people drift to my tits. I learned not to blush, but it still causes me embarrassment.
The other issue is that they are sensitive and brushing against anything, including my clothing, makes them harden.