Our expert says:
Sounds deeply fishy. There could be various reasons why you might have felt woozy, and a gentleman would indeed have taken you home --- but to then have had sex with you, is peculiar and at the very least extremely bad manners. It's a bit late to do any tests --- if you had gone to a pathologist for blood and urine screening the following day, they might have been able to reveal whatever might have been placed in your drink.
Could have been Rohypnol, and he doesn't sound worthy of being trusted. As Ncebza says, you have to be very careful in bars and clubs --- best to drink something which comes in its own bottle and gets opened in front of you, and which you keep a close eye on until you have finished it.
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