I know what a boner is.. But what causes guys to get them and why?
have an erection is not necessarily the result of being aroused. sometimes men get them for no reason and more frequently it is because they are aroused.
The penis is kind of a mechanical instrument...if you touch it in the right spot for long enough, it will have an erection. I know for a fact that it is very common for men to have an erection every morning when they wake up. usually this results in waiting for the erection to go away for them to be able to urinate.
watch p^rn..thinking about sex.and or just get one randomly. when we are teenagers we dont even need to be thinking about sex and we can get one