2015: Man-on-man marriage
2017: Man-on-child marriage
2019: Man-on-dog marriage
2021: Man-on-car marriage
2023: Hopefully the world ends by then tbh
Two consenting adults, be they man and woman, man and man, woman and woman, or any other combination not specified by the above, are now granted the right (as they always should have had) to enter a legally binding contract and obtain all its attached benefits.
Children cannot give consent. Children cannot legally sign contracts. Children cannot get married.
Animals cannot give consent. Animals cannot legally sign contracts. Animals cannot get married.
Optimus Prime is a sentient being and leader of the entire Autobot race and I don’t think you have any place telling him who his people can and cannot marry. If he is okay with Rewind and Chromedome or Astoria and Powerglide then you need to step off.