Let me (up)grade you (Neo)

Achievement unlocked! "Let me (up)grade you"!

Earn more than 30,000XP just from sexual encounters! You are the hunter's passion!

+hunter's passion destroyed

+10 CHA

+10 LIB

+semen production permanently increased by 100%

+earn XP from sexual encounters based on the (average) level(s) of your partner(s)

Reference
Unlocked in Chapter 162 "Chasing Easy Solutions (Neo)