Basically, you have the same traffic sources for a sex toy site like with any other porn site. I would suggest to search for your competitors and see how they are promoting. Top adult sites usually get the most traffic from Google and other search engines but Twitter or Tumblr is good for an adult content, as well as Reddit if done in moderation, there are some forums, but you have to find them for your niche and other ways.

You should definitely try to post some blogs that will target some keywords and improve your SEO rankings. Also check out my posts for some free advice: https://mradultaffiliate.com/tag/traffic/