Buy disposable enemas at Walmart or a pharmacy. These are packaged in small squeeze bottles with a thin nozzle that inserts into your anus. Fleet is a popular brand. Very affordable, usually sold in twin packs for a couple of bucks. Unscrew the top and dump the contents, refill the little bottle with plain water - enema solution may be a little irritating. 1 - 2 hours before anal sex, lube the thin enema niozzle, sit on the toilet, and slide the nozzle into your ass. Squeezing the collapsible bottle will cause the water to enter. Hold on, don't expel it. You can withdraw the tube while holding on. Just sit and hold it until it feels like you can't hold any longer. Then go ahead and shit. You can refill the little bottle if you want and do it again. You will expel water that's almost clear. Then, you don't have to worry about shitting during anal. It's easier for your bf to get in if you push out a little while he is pushing in. That sounds wrong, but it really works. Use lube on your asshole - something like K-Y jelly; it makes things easier. If you decide that you really like it in your ass (and you probably will), you can buy a small butt plug and begin to get your ass conditioned to accept a cock easier. You can gradually move up to larger plugs if you want. Just give it a little time. My gf did this, eventually moved up to a large plug, and she can be entered now very easily, even without lube. Don't worry about losing control - even with your ass plug-trained, your sphincter will still work fine. My gf likes a plug up her ass while she is masturbating, especially if we're having phone sex, and having a small plug in her ass while we fuck feels sensational to me - makes her pussy feel tighter. If you want to get a little wild, you can mix a little wine into the enema. Start with a small amount. Alcohol is absorbed through the colon very rapidly and you can get a nice hiigh while he's having you in the ass. Your bf should always wear a condom when he takes you in the ass; it's easy for him to get a bacterial infection, even after you have flushed yourself out beforehand. I got prostatitis once via anal, and it was a bitch. Sulfa drugs, fevers, chills, etc. So play safe and have fun. BTW, if you carefully wash the bottle, nozzle, etc, you can re-use one bottle several times. I think you'll have fun. Let me know!