This space is a bit crowded, but competition is a sign of a healthy market. You can go organic is always a good idea. While everyone should probably use antiperspirant before a job interview or family gathering, some of us really enjoy the smell and taste of pits, sans deodorant, and get turned on by it. Spanx is an amazing example of the type of ecommerce brand you should strive to make. No list of fetishes would be complete without amputees.
The term swings both ways:
Duct tape is a close second. You need to find a sub niche in this category. Which products do you feel should be on here but are not? Thousands of people are buying denim clothes for themselves or children each on Amazon every day.
Upsell and cross-sell opportunities, search volume and trending up.