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If the goal of the scene is to show why a person decides what he or she decides, then you only give the detail necessary to demonstrate that. If part of what changes Adam's mind afterwards is the ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/14104 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14104 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If the goal of the scene is to show why a person decides what he or she decides, then you only give the detail necessary to demonstrate that. If part of what changes Adam's mind afterwards is the way she _looks_, you need to focus on her appearance and not the act. ("He watched her face change as he slid into her" or "his eyes roamed hungrily over her breasts"). But if it's about the _act_, then you focus on how he feels rather than what she looks like ("Sparks of pleasure shot up his spine at each thrust"). If it's not about the act, you can elide a lot of the descriptions of genitalia into pronouns and vague references (he slid himself into her, she took him into her mouth, he touched the core of her, etc.). That gets the idea across without going too far into adult territory.