Its an imperfect solution that requires confidence in the merchant (that you find from many newcomers) and/or the willingness to risk a less secure means of transfering payment. Overall I think that in practice, merchants will stand to loose quite a lot in income. The risk requires suitable stakes - this site does not seem overly censorious and a degree of inconsistency is always to be expected with regard to adult material. Are we really keen to open the floodgates to anything at what aims to be a broadly inclusive community and marketplace? Matterial that is of too strong a nature would perhaps be inappropriate in this context, being offensive to many. Are the stakes really high enough to warrant that sort of action, would the result be worth it or even fully welcome? I think Life is too complicated to talk about absolute rights, or to believe in black and white scenarios - but I don't intend to stray too far into philosophy here. (at least, not without invitation)