How common is it for people to have multiple sex sessions?

So basically I'm just curious as my man has never went for sex again within the same day other than the odd time when its been once in the morning and once at night. People talk about having "round two" and waiting for their man to get hard again so they can f*ck again but I've never had that. Once he's done thats it I cant tempt him to go again he wont entertain the idea. Is it rare? How often does it happen lol. I feel i have missed out