Nobody really knows this.
Well, Robin does. Steve admitted it a few days after the events of Starcourt. He felt like it was a decent trade off after Robin admitted her secret. Robin was a lesbian. Steve was a Trekkie.
Okay, maybe it wasn’t an equal trade off.
Everyone: ‘that’s the third time this week… hmm…’
Everyone: ‘that’s the third time this week… hmm…’