(i scanned this with my scanner instead of my scanning app, i wanted to see if it can out better that why.)
though my two Rainbow Dash OTP's (PinkieDash and AppleDash) are both yuri ships i still don't think RD is 100% lesbian, i mean, just because your a girl who likes rainbows or likes sports and stuff mostly associated with dudes doesn't mean ya' like chicks (or don't like guys). now, i personally am pretty gender blind when it comes to ships, so i ship her AJ mainly because i think the two would get along in a romanic relation ship, one or both of them could be dudes and i wouldn't like this ship any less. but i also like to think that Equestria is a VERY LGBT friendly place, so i'm going to assume that a good portion of the ponies are bisexual or pansexual, i just think that some might think one gender more than the other.
anyway heterosexual Dash ships:
BraeBow:
Braeburn is kind of like a mix of AJ and pinkie pie in terms of personality. only he's a stallion instead of a mare. i think the two would get along very well, since there both very athletic and hard working as well as laid back and always looking for fun and stuff. but i also think that RD would get pretty easily annoyed by Braeburns antics.
Blue Dash:
BlueBlood is a douch, RD can be a bitch, i think that Rainbow would be more tolerant of BlueBloods snootiness, in fact she would probably just make fun of it. also think BlueBlood would find her annoying, yet cute at the same time.
Rainbow Spike:
they're both very laid back and enjoy a good laugh. they're really good friends, i could see them dating once Spike got old enough.