Is my husband scrambling his sperm?

Wasn't really sure what category this fell under so sorry if it's in the wrong place 
I know us ttc ladies just love tmi posts, but either way I thought I'd warn that there's tmi to come! 😜
I've tried to look this up on the internet but I can't really find anything about it, so I thought I'd take it to the experts. After my husband ejaculates, he likes to keep going. I've been wondering if this has any effect on the sperm? Like, is he jumbling them up and hurting them if he keeps going? Out of paranoia, I try to just have him stay still, but I can't always stop him. Lol 
Just wondering if anyone else has an opinion on this matter