Exactly. The heterosexual relationship exists as an apolitical dominant group within society as it is the basis for society and the major group from which all others spring.

Heterosexuality has zero government protection & promotion. Convincing a heterosexual child that he or she is gay is not illegal in any state while doing the reverse is considered conversion therapy that in at least 12 states that I'm aware is illegal. Here's a exercise: Go to any search engine and look for heterosexual summer camps. You'll find none. Do the same for gay summer camps. You'll find aplenty. Heterosexuality has no institution (marriage) that is uniquely protected by government.

The sub-groups, homosexuality, bisexuality, non-binary and transsexuality are all politically active groups that receive both government backed protection and promotion with ever increasing breadth across our social fabric influencing a younger and younger audience year over year. If one doesn't believe it, one merely needs to examine the over representation of homosexuality in education and popular media.