“Good” and “bad” are cultural decisions. One classic example is the use of the word “fuck”:
In medieval times, monks, who were the holiest of people, abstained from sex completely. No touching, no temptation, no nothing. Sex was forbidden in order to be blessed by god in heaven. The word fuck meant the same thing it does today: to have sex with. Because the sex was so unholy, people weren’t even allowed to say the word. People have taught the next generation not to say fuck for hundreds of years. Really, what we’re teaching is to control sexual urges.
This can be traced back even further (although, I’m just thinking off the top of my head at this point onwards, there’s no evidence to prove what I’m about to say, that I know of.)
Sex was considered bad because people believed that Jesus was born from a virgin mother. So, in order to replicate the miracle of Jesus’ birth, holy people (who were usually descendants of Jesus and the disciples had to replicate this and give birth in a virgin manner. Only the priests were responsible for this because the other people were not holy (because they weren’t descendants of Jesus or the disciples).
Anywhoo, what I’m trying to say is that what is acceptable and what is not goes back a very long time. One modern person doesn’t create these laws of “good” and “bad”, but as a community, these rules are developed.