That's called an erection. Another way a penis gets bigger is by slowly growing bigger as a boy's body grows to the size of a man's body. That's a really interesting question. A homosexual is someone who is attracted to and falls in love with people of the same sex. Many boys have really close friendships with other boys, and it doesn't mean they are gay.
Families have really different beliefs about homosexuality.
Some families believe you're born that way and that it's normal that some people are homosexuals. You need to talk to your families about what they believe about homosexuality. Whatever your family believes, it's never acceptable to hurt or tease someone because you think they might be gay or lesbian. You have several options for these types of questions. You may need to answer more than one possible question.