The line is health versus pleasure
With sexual wellness products, the same item can land on either side of the policy depending on how the ad talks about it. Meta allows sexual and reproductive health and wellness products to be promoted to people 18 or older, as long as the focus is on health and medical efficacy rather than sexual pleasure or enhancement. Its allowed examples include contraceptives such as condoms, plus lube and pheromones. Products that focus on pleasure or enhancement, such as sex toys and non-surgical genital enhancement products, are not allowed.
TikTok draws the line in similar terms. In the United States, condom and lubricant ads must be restricted to audiences aged 18 or older and must not focus on sexual pleasure or be overtly sexual. Its adult content page lists sex toys and products for enhancing sexual performance or pleasure as not allowed. The product category makes the ad possible; the framing decides whether it fits.