Is sex on the first date good or bad?

I have a habit of going to lots of date, getting to know a guy for a while until I feel it's enough to move onto next step like sleeping together usually it doesn't happen fast. However 2 of my Flatmates are girls n they all bring her first date home n eventually have sex with them. They told me it's better n faster that way n I've been doing it wrong because the guy will run away if I let them wait for long time. I prefer to take it slow n if he just wants sex then he'll disappear soon n it's even better for me to eliminate fuckboy out of my life, isn't it? Am I doing it wrong? Am I too outdated for nowadays relationship?
Is sex on the first date good or bad?
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