Is sex on the first date a good or a bad thing?

So… Im meeting this guy tomorrow, we arnt really going on a date he is just coming round mine to hang out but think he may have a few ideas in his head that we, shall i say ‘end up in the bedroom’ Is it wrong to sleep with him tomorrow or not. This is the first time we have met up in agessss! like years! And if it isnt a good idea sleeping with him then any ideas how i can keep him downstairs and to keep his hands to himself!