Of course Tony knew that. Because Steve wasn't the sort of guy to go around adding a ton of notches to his bedpost (not none, just not mass quantities either) and if he said dating, that was what he meant. Dating was not having random sex and then maybe breakfast the next day or some other version of the same.
Dating was dating. It involved getting to know someone, seeing them multiple times. Occasionally caring about their opinions, if they had any. And surely, if Steve I like them sassy Rogers had been seeing anyone, they had to have some opinions.
Pantsless, there wasn't a lot to fidget with and that was probably a shame and a good thing all rolled up into one. Tony stilled (sort of, as much as he ever did) and shifted slightly so that he was laying more on his side head propped on his own shoulder. "I'd argue probably everyone needed it. After." Well, they knew what after. There was probably no real coming back from that -- even if they'd all eventually found a way to reverse it. "Where'd you meet?"