Partying is, besides dancing, also nice flirting. But avoid regrets afterwards. Indicate what you want. Does the other want something that you don’t feel like? Maybe you’re not such a good match after all. You don’t have to be fooled and you can always change your mind!
Everyone has a different limit for what behavior they find desirable or undesirable. Is one person okay with being kissed by a stranger? No one else is waiting for that at all. It is not always so clear where that limit lies. So check if the other person likes it as much as you do, with the simple question: Are you okay?
And if that happens, use condoms. They protect you against STDs, HIV, and unwanted pregnancies.