Virtual Same Sex Marriage is Thriving in Mabinogi:

 Spoiler

Domestic Violence!

But real talk, the Same Sex Marriage in Mabinogi does help quite a bit.
There is a stat boost whenever you're near your Hubby/Wife (albeit small, but still cool) and comes and goes within time.

..There's also the benefit of never having a "permanent Male/Female if you're married" situation pop up ever again. I was afraid of having that problem until they actually released the marriage option.

There are some inappropriate RPs, though. Ngl.