IE5 isn't old. it's probably the most widely used browser atm...
if your users are using IE2, IE3 or NN3.0 or lower, they're probably not going to buy any porn. most porn sites probably wouldn't render correctly, or their signup forms would break. also.. if they're too lazy to download a new, free browser, or buy a new copy of the OS or something... then they probably aren't going to buy porn either
