Unexpected but surprisingly pleasant post.

Thank you Alt for finding easy way to explain difference between AND-ing and OR-ing.
Here are some thoughts from inside the company.
By programming this we of course were confronted with this question and had to answer it. Initially we designed Categories so that, as Bulma correctly noted, from the practical point of view there were no need for AND-ing inside one category and OR-ing between categories.
Most of the Categories do “OR” inside category and “AND” between the categories.

However, recently we introduced Safety features in Lubricants that allows selecting “glycerin-free”, “paraben-free”, “L-arginine free” lubricants. While working on this category, we realized that this is the perfect example of the category which should do “AND”-ing inside it. Totally practical consideration, if you pick “glycerin-free” than you probably want something that is ALSO “paraben-free” etc. Therefore, we coded this category with AND logic, instead of usual OR.

We also revised several existing categories and switched them into default AND logic.
Those are: Safety features and Special features in Vibrators, Dildos and Anal toys.

We thought about making this logic as a setting for each filter category but decided against it. The main reason was that this is simply too much for the majority of the people. We haven’t seen anything like this on the internet.