If you are interested, go ahead and attend a party. At the very least, you'll be exposed to what the Lifestyle really is, not the stuff you've read about, and not the fantasies in your head (either bad or good.)
I do suggest that before you go, have a good talk between yourselves. Decide how far you want to go that first night, then make sure you don't go any further than that. You can always take another step your second time, but you can't make a mistake just go away. Watch your alcohol consumption, too much booze is not good for following rules.
Also, there are various birth control options that don't require condoms, talk to a doctor or do on-line research.