This post today is of a highly sexual nature with explicit and crude language (really cause there's no other way to discuss this), so consider yourself warned.
"Give them lube!"
I actually shouted those words once to my ereader. No joke. Reading along in a really fabulous m/m novel and the two guys were getting all hot and bothered for each other big time. The one dude flips the other over and BAM rams right into his ass.
I winced, flipped the page and kept reading. Next sex scene...same thing. Needless to say, I couldn't finish the book. I know books are about fantasy and sometimes we're supposed to suspend our disbelief, but there are times where I just can't. And this is one of them because I write stories where anal sex does happen.
Mostly this post is about doing thorough research. Now, I'm not saying that you should traipse off and have anal sex if that's not your thing. You can successfully write about it and never actually DO it. But you do need to do some research if you're going to write about something like this. And really, if you're writing something in that great of detail, you shouldn't be squeamish about the research, IMHO.
Knowing the basics is going to translate better on the page for a reader, and better research makes for a better author.