From what I tested, it is exactly as it says, just like the MOD in Elise's clinic, it decreases negative effects on STA which is pretty good for sickly race like Abomination, the highlight though is the yellow text there. The gland it is refering to is linked to Lona's G-spot, if you apply the MOD (G-spot Removal) in Elise's clinic, that MOD will disappear the next half day, meaning Lona just regenerated her G-spot as per the description in the yellow text. This Prospermia state can be detrimental for people who want Lona to not cum at all but not really a problem in her adventure. There may be more to this health state but this is all the effect I noticed from it so far.