Can a man keep having sex after he has ejaculated? and if so what would be the reason?

Anonymous
I had sex with a guy that I have known over a year. The other day we were in the doggy style position and I felt his penis throb a few times like it does when he ejaculates, he did stop thrusting during this time but he still remained hard and continued sex afterwards. I have never had this happen before and I am curious as to why he would be able to still have sex after he ejaculated.
Can a man keep having sex after he has ejaculated? and if so what would be the reason?
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