It's their party, and they'll perform hardcore sexual antics if they want to.
There is a distinct lack of either partying or indeed Las Vegas on this site, and as such it marks the title out as somewhat misleading. What we do have here is a site that is mostly concerned with threesomes. Erm, and that's about it really.
That it's not exclusively concerned with group sex antics would suggest that this is one of those Adult Lounge sites that they've slung together without really thinking about its content. It's almost as if they had some leftover galleries but didn't know what to do with them. So what you get are some rather uninspired videos and a very small amount of picture galleries, not to mention a few feeds that just seem to be completely random.
Proof apparent that Adult Lounge does have some creases that still need ironing out. This is one party I wouldn't bother gatecrashing, if I were you.