1st time having anal

So me and my boyfriend have been talking about anal lately. Well actually he's been bugging me about it for the past year and now I'm considering it. My whole thought on anal was its gonna stink and something embarrassing is going to happen. I've read stories online of girls pooping on their boyfriends.. I don't know what to expect. Should I use an enema? Do enemas hurt? How bad? My boyfriend wants to finger my butt before.. That makes me feel very weird.. Lol. I wash everyday but I'm still scared it'll smell or some will come out. Maybe I'm overthinking it. My boyfriend told me it's not like your poop sits in your butt.. It's in your intestines until you have to use the bathroom. It only passes through which he has a good point but I just want to be prepared. How do you girls do it? What positions and foreplay? Lube? I want him to use a condom but he said it'll dry out quickly.