Sex Formula

Sex Formula is an adult narrative game about meeting Reika and beginning a life together. The game has Desktop and VR versions, and you can play the Desktop version without a VR headset. Reika will not agree to date you until you satisfy her sexually, even if you already have a physical relationship.

Story and relationship

The story has 8 chapters, each approximately 10 minutes long. It follows how you meet Reika and how satisfying her leads to more advanced sexual activities. Reika has menstrual cycles, fertile periods and changing levels of sexual desire. If you do not take proper safety measures during her fertile period, she can become pregnant.

Sexual activities

During cohabitation, you can engage in sexual activities with Reika at three locations. These activities include:

• Foreplay: 21 positions per location, 63 in total.
• Sex: 18 positions per location, 54 in total, including oral sex, handjobs, titjobs, intercourse, anal sex and footjobs.
• Climax animations: 18 positions per location, 54 in total, including oral sex, handjobs, titjobs, intercourse, anal sex and footjobs.
• Reika’s orgasm animations: 4 positions per location, 12 in total.
• Reika’s special services: 2 positions per location, 6 in total.

Dialogue and presentation

The dirty-talk system includes animations and 234 sets of dialogue per language. The dialogue varies according to the type and level of arousal. A cross-section view system offers two display options: a windowed view like the one in the previous game, or a view shown directly on the character’s body.

Voice acting

English and Japanese voice acting covers moans, dirty talk and all dialogue.