Already explored; google ads, facebook ads, pop ads, native ads, adult ads, PoF. Blog SEO and affiliate outreach don't send enough.
Looking for specific websites, or individuals with contact info.
Do you offer a service already?
What is your goal with find "big volume of quality dating traffic"?
Usually "Don't Send Enough" sounds like your conversion rate in that channel isn't as high as you need. Which in turn usually means the traffic isn't the most qualified, which in turn usually means its the wrong channel for you :-)
I'd look at your website first then make some recommendations after looking at what your main competitors are doing across the same channels.
However, there is loads of traffic out there, sometimes though its about tweaking your offering to fit the traffic you can get and afford.