You can:
1. Buy targeted traffic and send it right to your sites. I've heard good opinion about those two services:
http://www.trafficholder.com &
http://www.trafficadept.com/. You can also try here:
http://www.chokertraffic.com,
http://www.realadulttraffic.com
2. Buy banner spots (
at chubbyland for example). Check this
site for full list of available spots.
3. Make some gals and buy gallery spots using
GTS 