Yeah, manspreading is a very specific very obvious think to do. And literally has nothing to do with one's balls unless of course they have serious issues with said balls. Maybe one is missing. Maybe they've just been through surgery so they can have more unprotected sex. Maybe they've masturbated to the oldies. So on.
I'm a 253 pound dark skinned black man who never had to and never has manspread. The only time i've even come close is from an injury that made it so i couldn't sit normally. And the only other times i couldn't sit normally is when i was hiding a hardon.
As far as i can tell, by the examples given and the examples i just checked out online, manspreading is men's way of passive aggressively marking themselves as the most overly emotional gender alive. It's tantamount to a cat pissing in a corner.
Now, that doesn't account for men with health issues. There very well could be men out there who've have problems with the veins in their dick criss crossing and harming things. Read about that here on lpsg.
Other than health problems though. No. It's just men's way of making themselves feel better about themselves. Again, i'm a 253 pound dark skinned black man. And whenever sitting in public i not only don't manspread but i actively move if there aren't enough seats. Will even get up if someone elderly needs one or someone with kids needs one.
The only time i've ever crushed my balls from sitting is when riding a bike. Then again, the weight of both my balls and penis is such that i can readjust without having touched either given certain circumstances. So maybe that's more at issue here.