3 options, all of which i have tried
Option 1) Traditional personals. There are women on normal vanilla personals that are dom in nature. Just read the descriptions and you should be able to get an idea. The bossy, snarky, almost bitchy types will normal be more than happy to dom you.
Pros: Does work and you can be more open about it. Work/friends subliming upon your page is not a big deal.
Cons: fairly hit or miss. LOTS of guys use these things. Also there is some guess work and you will guess wrong on occasion.
Option 2) tinder or PoF
I had some luck on tinder and Pleny of Fish. Tinder is well known for hookups so you can churn and burn numbers till you strike gold. PoF makes it a bit easier since they have sex habits and kinks as part of the profile.
Pros: Higher success rate than a stander personals. In 3 months of using both i found 1 dom in tinder, and 2 in PoF. So average 1 dom a month for me.
Cons: Both have a stigma. So others finding your profile may be a problem if you have a professional job/image to keep. Also, tinder if ONLY worth it if you pay for the full membership so you get unlimited swipes.
Option 3) Ashley Madison
I know i know between the nature of the site, and its fairly recent hack lots of people say this site is BS. But this is the only method that connected me with a Domms that was even more sex hungry than myself. So i would use it again in a heartbeat. If you are worried about your personal info, just buy a visa giftcard and use a fake name for paying.
Pros: Any woman you meet here is 100% all about sex. No games, just sex. And at least 1/2 want to be in the driver seat.
Cons: at least half the profiles are fake so expect to spend money for nothing (they charge per message you send).