Why do young girls want a boyfriend?

out of curiOSity, adolescence is a very difficult period and its the time when teenagers wants to experience a lot of things,so they want to know more about the opposite sex.

moreover it has now become a kind of culture to have a boyfriend when you become a teenager, so just to fit in, they go for a boyfriend.

there is also a kind of peer pressure or jealousy "if my friend has a boyfriend,then why not me?"