Why do some cultures reject people of the same sex for sharing love ?

I think it's because they were told that man only should love women and vice-versa but that's not true. Some cultures also think about next generation and they think that's not natural. As a Demissexual girl that's my experience.

People have certain religious beliefs about two individuals from the seams sex sharing love which forbid it. Because it opposes the right nature of the human being. They don't think people of different senses are just the commonest thing they think it is the nature of humans. So they think anything but that opposes that nature some others see it as a different thing not common so they automatically think it is probably wrong.

In some cultures same sex relationships are seen as not only morally wrong but also going against religion. It might be thought that they are going against god's will in some places or against what the Bible says. These people tend to have quite a closed mind, and may also reject those in other cultures as they do not believe in the same things that they do. In these cultures, people often grow up thinking that these relationships are wrong, or sinful, and are often taught about these 'sins' in school. However, these people may think about supporting such relationships but do not due to fearfulness and the chance of being excommunicated from their religion.