What does it mean when you kiss a boy and they get hard?

Answer 1

It means that you have aroused him sexually. Different boys get aroused by different things. While not all boys get as easily aroused as a kiss, many do.

Answer 2

Physical arousal, such as getting an erection, can be a normal response for some people when they engage in intimate activities like kissing due to the release of hormones and increased blood flow to certain areas of the body. It does not necessarily mean anything other than a physiological response. Communication is key in such situations to ensure mutual comfort and understanding.