Why the constant increase in homosexuality and bisexuality?

As people become less bigoted, and more tolerant of homosexuality and bisexuality, homosexuals and bisexuals feel more comfortable being open about their sexual identity. Since the Gay Rights Movement in the 1970s, gays and bisexuals have become less willing to hide their sexuality and be ashamed of it.

Homosexuality and bisexuality isn't increasing. Rather, more and more people are admitting to it.