I would say... $x, maybe less. Unless you develop the site and have crazy traffic to it... Depending on what type of traffic you get, you can fix your price.
I don't see how domain names like that will ever pick value, that's the reason why it was never registered until you decided to go for.
"sex luva" returned a big fat 0 results on Overture, so your asking price should be also 0.
Here, now you have an honest answer.