Ok, i can talk from a guys standpoint that when you get an erection, you wish it wasnt there almost.
Some of us are so freaked out that you might just up and slap us or something
Just three days ago i made out with my new gf for the first time, and it was in front of my friend (truth or dare) and when we were done my friend cheered and said "so... you standing at attention?" and of course i only laughed, but my girlfriend instead hugged me real tight and started nibbling on my ear
yea... that made the matter only worse