There's nothing innocent about anything. If it's alive and self aware it can, and most likely wants too have sex. Thus talk about their interests in any light is standard. It's been going on for decades for all kinds of creatures/characters. There's nothing wrong about it especially if you're joking around.
And wtf are you talking about romance in the show doesn't matter? There's was an entire episode dedicated to Cheerilee not having her very special some-pony for Hearts and Hooves day.
And a giant running gag with Rarity is she wants her handsome lover to be found.
Just like most things, it was a topic for an episode of the show and a plot point for a season finale.
Remember how only love could conquer the changelings and how their love for one another was the only thing keeping the barrier up in season 3's premiere?
cmon now.
In case you're all wondering, or should've figured out by now, i'm entirely neutral against any and all talks/acts that don't hurt anyone.
Saying, doing, or watching anything that doesn't harm anyone physically or mentally in any way, TOTALLY FINE.
So stop being so judgmental when it comes to dumb crud people say on the internet.