A boner is NOT an indicator of sexual attraction or consent.

For the women out there, a boner is completely independent of how turned on a guy is or isn't. I have gotten a rock-hard boner just because of a light breeze. I have been soft when a woman I've wanted for over a decade is completely lost in emotions for me and is committed to fulfilling my every fantasy. Horny ≠ Hard, Hard ≠ Horny. Men being hard is not unlike a woman being wet. You're not just gushing the whole time, and I'm not hard the whole time. I've had erections that've lasted 15-30 mins just because of foreplay and they fucking HURT and ACHE. I'm not going to act like sexual arousal doesn't help, but it's one of many factors. Whether a man gets an erection or not is complex and depends on a range of emotions, not just whether he's horny; if I'm nervous, I won't get hard no matter what. Stimulation of any kind can trigger it, even and in my case especially if non-sexual. I work in a hospital and regularly sponge-bathe men who are out of it completely, and when it comes to that area 9/10 times they'll get hard. I had to explain this to my wife our first time when we were trying to consummate, and she thought she was unattractive because I couldn't get hard the first time. The second time, I got hard and finished inside in like 20 seconds, so that gave her a lil pride and I wasn't and am not willing to correct her in that that means absolutely nothing.