well all the sources I have is.. three from a perk from sofie, two's from the nymph in the forest, Kotone's Blessing gives you one, Kaia gives you another, Villi's Titty Slave is a +1, all the spiritual perks add up to 3, and the blessing of venereae is the last one. 3+2+1+1+1+3+1+Base 3 = 15.