Yep, many! Today's era is quit unusual in how few open gay and bisexual relationships are had by public officials (which are the unions that are typically best recorded). In many other historical periods across different regions, today's standards would be considered unusually heterosexual. https://en.wikipedia.org/wiki/History_of_same-sex_unions

No there were not. The other reply confuses acceptance of homosexual activity with acceptance of homosexual marriage. The latter is a new concept, the former was common in many cultures (notably Ancient Rome / Greece).

Homosexual activity cannot result in biological children so there was really never any society that considered anything like homosexual marriage until our own. The main reason for marriage was to control sexual unions and the children who might result from them. In societies which had marriage (many had no such concept) homosexual marriage didn't make much sense.

The wikipedia article on historical same-sex unions mentions that some cultures had rituals around cementing homosexual relationships but those wouldn't be considered the same as marriage, they'd be more like any pre-sexual / pre-relationship rituals. Marriage typically is about the sharing of finances, responsibilities, the raising and rights of children, etc. And none of the examples in the wikipedia article on historical same-sex unions concerned any of these.