This post is the result of a brief spiel between myself and @surreality over in 'Random Bitching.' So here's my initial thoughts on the topic. Feel free to add in.
And I'm going to just go ahead and try to say: if someone comes in with a question, try to be nice. I know this is MSB, but this isn't in the Hog Pit and I'd like to keep it that way.
To start us out, here's some articles on the topic of writing sex. I have tried to avoid the tl;dr articles. I have tried to avoid the ones by authors who abuse a thesaurus. YMMV here. You may enjoy 'throbbing manhoods' and 'pearl of womanhoods' and describing women as food. I don't and I've found the most engaging TS (whether as a participant or relayed to me later) doesn't, either.
Also, I went through nearly three dozen articles to find these. Most of them were garbage. You're welcome.
Articles by professionals:
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http://www.utne.com/arts/how-to-write-a-sex-scene.aspx
In my mind, this might be one of the best articles. Ever. Period. It's informative and has the sort of tongue-in-cheek humor I love. Seriously, anyone who wants to write sex (be it for TS, a novel, or their long-imagined Kirk/Scotty slashfic) should read this article. (BTW, for handy reference per his last point: https://www.biblegateway.com/passage/?search=Song+of+Songs+1) -
http://emmadarwin.typepad.com/thisitchofwriting/2014/08/ten-top-tips-ahem-for-writing-sex-scenes.html
Her first point contains my philosophy for TS. Will it affect the story or not? Some of the best TS I've had recently involved discussion, during the act on how to take down another PC. Sure, it was TS, but there was also plot involved. Your best TS scenes will almost, without fail, be the ones that involve a point in story (either overall or for your character themselves). She also makes another good point: you don't have to write everything. A single, well-written pose or two can contain most of the ol' in-and-out itself. -
http://www.randysusanmeyers.com/blog/2013/04/writing-and-reading-sex-scenes-good-bad-ugly/
I include this primarily about the point that it's easier (or the outcome is better) to write about 'bad' sex. Not 'Oh man he totally couldn't find the clitoris' bad, but 'The character is damaging themselves emotionally in some way.' This is why the romantic, sappy, 'they're so in love' TS scenes get so dull. It's the same thing. Everyone can imagine it. There's nothing engaging in those poses, nothing to latch onto and use moving forward. I can do so much more with 'Oh man, Sal is totally sleeping with him so he'll buy her drugs,' than 'Oh, it's just another Friday night for happy couple Bob and Sue.'
Articles by fanfic writers / roleplayers:
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http://poshhelpers.tumblr.com/post/41724164666/how-to-smut-for-virgins-getting-started-when-i
Overall, this is skim worthy. However, the author included some great questions to ask yourself about your character's approach to the 'scene.' I've got some people out there who I've TS'd with on different characters. And some of those people, well... once the TS begins, their PC disappears. This kills a 'mood' more than anything else, sometimes. Don't forget your character when you're TSing. If anything, TS is the time to delve even further into their psyche. -
https://aron-kristina.dreamwidth.org/9755.html
This is a very, very technical article about writing about sex between two women. However, it links out to educational stuff. I have seen men write great lesbian sex and I've had women ask me OOCly beforehand for any advice. So I share this because I am sure there's someone out there who could use the intel. -
http://thorhelps.tumblr.com/post/39030227340/how-to-write-lesbian-smut
Another article on writing lesbian sex. This one is more about the fun part of things rather than the technical.
Misc. links:
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http://tvtropes.org/pmwiki/pmwiki.php/SoYouWantTo/WriteASexScene
I share this just because I know some of you are tvtropes addicts. But it's not a bad read, either. Especially if you want to know more details about the tropes you should be avoiding. -
http://www.mcsweeneys.net/articles/how-to-write-good-sex-scenes
Yes, this is meant as a joke, but I swear some people out there use this as their Guide to Writing TS. -
https://twitter.com/Lit_Review
Not an article, but these are the people behind the 'Bad Sex in Fiction' award and will often post excerpts/nominees. Example: “Now he realised that he was inside her, ejaculating toward her uterus” (from Haruki Murakami’s “1Q84”) and "at the end she began to gasp 'oh dear, oh my dear, oh my dear dear god, oh sugar!'" (from Stephen King’s “11.22.63”).
I know, there's no articles on writing gay (between two male characters) sex. This is for two reasons: no good ones came up in my search and I've never been particularly good at it (I'm bisexual IRL and physically attracted to women). Someone else can chime in with tips for gay sex, if they'd like.