Let's be clear about language. The American Heritage offers these meanings to the verb:


1a. To join as spouses by exchanging vows. b. To take as a spouse. c. To give in marriage. 2. To perform a marriage ceremony for: The rabbi married the couple. 3. To obtain by marriage: marry money. 4. Nautical To join (two ropes) end to end by interweaving their strands. 5. To unite in a close, usually permanent way: "His material marries the domestic and the exotic" (Clifton Fadiman).

INTRANSITIVE VERB:
1. To take a husband or wife; wed: They married in their twenties. 2. To combine or blend agreeably: Let the flavors marry overnight.

Of these, 1a, 1b, 1c, 2, 3, and 5 apply equally easily to same-sex as to hetero-sex ties. So does intransitive 2, but leave that aside.

It's pretty clear that the predominant definition is non-specific about gender.

A