I genuinely do hope that Rainbow doesn’t have any weird “sexual” stuff going on with her (no offense to the author btw, just don’t think it’s the best decision to make from a writing/narrative perspective).
I think that if Rainbow Dash were to get into a relationship with “somepony” it should be an original character, I think that maybe she ought to meet a pony that is new, and a bit distant from the typical environment she’s used to.
(maybe some guy pony that isn’t from Ponyville, Canterlot or even Cloudsville?)
Edited