And next thing to know is that both of them are gonna be on Rarity’s bed sleeping after they had a “workout” the night before

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A terrible flirt in that she’s terrible at flirting? I agree.

So…magic drunken rape, then?  
“Dubious” consent indeed. Is it dubious when the subject has no idea about it? “Dubious” is in the right direction, but I’m not sure that’s the right word for this.  
I wonder what that word could be.  
And of course, it’s “due hur Rarity is slut because dresses and ‘flirt’ stuff” despite her showing interest in one dude through Equestria Girls. I guess complimenting someone and fluttering eyes sometimes maybe equals cocksock around here.  
And a pony aphrodisiac spell? What would be the point of that? How would she even cast it?
 
I’m prepared for the “you’re thinking too much” and “look at this autistic loser” replies. I have a teddy bear and everything.