I always try to keep it inside too. Sometimes it just doesn't want to stay in though. My partner also likes to have sex early in the morning, so if he shoots inside me, I usually want to get rid of it before work. I don't want any surprises later.
My ex and I were very much into kinky play. His favorite thing to do was to a guy's ass. One of my favorite things about him was he shot the biggest loads. I loved when we did 3-ways and the other guy and him would fill my ass with cum. About a year after we had broke up, I had met up with a guy online. He blindfolded me, took my out in the middle of a field and fucked me until he shot inside me. I was still horny, so I went over to the ex's house and luckily found out that his front door was unlocked. I went inside, stripped down naked, went into his bedroom and started sucking his dick to wake him up. When he woke up, I told him I had a surprise for him, and made him rim me. He was turned on instantly and went to town on my ass. He then fucked me and left another load in my ass. It was pretty damn hot!