Love is love, but it has its legal limits. If it's pedophilia, zoophilia/beastiality, necrophilia, or incest, then it's illegal.
Also, raping someone isn't love at all. It's sexual abuse.
In the case of LGBT+ people, the "love is love" quote applies. (In case you were wondering... I'm pansexual, meaning I like anyone (in my age range, that is), regardless of gender identity or expression)