Are there 'viral' marketing tools avail for the adult market?

[maxx]

thanks Tpat for the advice. I have another question for everyone that probably should be a new thread:
We know that tons of surfers just look for all the free stuff, get off and go. Does anyone have current statistics/percentage of people who are actually buying memberships vs the population at large. You know, the people that provide our income and allow all the others to get a free sample ad nauseam...