As for skills, they are as follows
Kiss - Default
Handjob - Lose 2x
Intercrural Sex - Lose 3x
Titjob - Lose 6x
Deep Kiss - Lose 10x
Fellatio - Lose 13x
Irumatio (Body) - Use Titjob 10x
Vacuum Blowjob - Use Fellatio 10x
Anal Sex - Lose 10x against Worm, Insect, Small Worm, Ground Tentacles, Giant Penis Monster, Egg, Cum Containing Monster, or Game Tentacle Boss.
Sex - Lose 10x against Slime, Tentacle Plant, Octopus, Vibrator, Succubus, Torture Device Monster, or Kraken.
Masturbate - Lose 1x
Vibe Masturbation - Talk to the girl in the NE corner of the second town
Anal Masturbation - Talk to the girl in the NW corner of the home village once you return. Must have Vibe Masturbation.
Double Masturbation - Talk to the girl in the NE corner of the town in the Product Version of the Game World.