Unfortunately the male figure has some basic errors like missing colliders, distorted testicles, a.s.o. It never has got as much love as the female figure. This is a known bug, but the female figure and other features had always priority in the VaM development. This is no criticism, it was how it was, back in that time. We all wanted new exiting features.
As you may know, the developer(s) of VaM is (are) in the middle of developing a brand new, comletely re-written version of VaM. Untill that long-awaited future Version, we will (most likely) see no fix for those issues any more.
Maybe you can use the Collider Editor plugin from Acid Bubbles to clear the mess a bit, or maybe you look at the Supplementary Colliders For Male by Urukyay if that adds colliders to work with... maybe there will be a plugin that solves this issue some days.
But "as it is" the male testicles in VaM are buggy as hell.