This is kind of a grey area, since it involves our real life partners. It is the same with our SO sending us explicit pics, sexting, dirty talk on the phone/in chats. We are actually interacting with real persons here, but the actions are very similar to porn use or rather arousal by porn. Of course our SO is not a porn actor, but on our side it at least also fires up our "porn pathways" due to the at least partially artificial stimulation.
So yeah, the prudent thing is to stay away from that during recovery.
Ejaculation is the most energetically taxing function that the body has so it takes time to recuperate.
I feel
a little bit more exhausted after a two hour run, a good lifting session or a hard day's work with manual labour - than after an O. Sure, it does take quite some energy to produce sperm, but to say it is depleting our body of so much energy is a bit of an overstatement imo. ; )