Potions are only partially implemented, otherwise the majority have their own use. Version 0.11 has three new sidequests each with their own NSFW scenes that don't appear as locked in the public version.
Potions which have a use in the public update include: Spring Water, Chastity Potion, and the Lubricant. In the Patreon Update, Pec-Builder Bulking Tonic gets added to that list :)