Until recently, same-gender interests were comparatively rare.
Others really don't care about the brand beyond it.
Regardless of opinions, Transformers engaging in or pursuing interaction of a romantic nature is a well-established element in pretty much every continuity.
Existing as a fan term mostly, it has been used in two official sources, the end-of-game bio for Airazor, in reference to her and Tigatron, in the Nintendo 64 version of the "Beast Wars Transmetals" video game and again in Venus.
In addition, Downshift's Cyber Key Code info appears to refer to Transformer marriage in stating that he and his lifebond partner "joined together under the Covenant of Primus".
Scarlett and Bumblebee had a suggestive conversation about "riding" him in "Wolves", and in "The Art of War issue 3", Arcee promised Bumblebee to "rotate his tires" if he could beat her, to which he responded with a most enthusiastic "Wooo-Hooo! In the Dreamwave issue "Infestation", one remark from Sunstreaker might suggest the existence of Transformer S. Take note that doing so will be at your own risk, and TFWiki accepts no liability for any psychological trauma incurred.