Hello,
I have an issue with all the sleeping bags (mummy bags) I've tried.

I get an excessive build up of sweat between my legs in the groin area that makes sleep very uncomfortable, if not impossible. Since I'm a side sleeper and my legs are confined in a mummy bag, my legs are constantly on top of each other and this sweat never dries.

I often find myself stuffing a sweater between my knees to create some extra breathing room, but this rarely helps much.

This is something that happens in all temperatures I've slept in (25F-65F)

About me
Male, 6', 195 lbs
I've tried various sleeping bags, but my current is a sierra designs dridown zissou 23.
I've tried various boxers/boxer briefs, including smartwool microweight boxer briefs, exofficio boxer briefs, adidas boxer briefs, REI syn boxers, and regular haynes boxers.

So, is this something that can be avoided somehow? If so, what can I try to make this better? This is, by far, my biggest nuisance when sleeping outdoors.

Thanks!