Why use liothyronine instead of levothyroxine

Why use married women instead of single women?

Awesome story! Why does Tefler use kerb instead of curb, though?

Enjoy reading the story, but it would be a better read if you fixed the spelling and grammar issues in all chapters. Read and pay attention to the advice given by Tx Tall Tales (https://www.literotica.com/s/love-your-readers).
Specifically:
- Use Both instead of The both (https://english.stackexchange.com/questions/159907/both-of-you-vs-the-both-of-you)
- Use himself instead of his self (https://languageandgrammar.com/2008/04/30/rid-yourself-of-hisself/)
- Use myself instead of my self (https://english.stackexchange.com/questions/316090/when-to-use-myself-and-by-myself)
- Consider cannot instead of can not (https://english.stackexchange.com/questions/204006/cannot-vs-can-not)
- Use alongside instead of along side (https://dictionary.cambridge.org/us/grammar/british-grammar/along-or-alongside)
- Use afterthought instead of after thought (https://www.merriam-webster.com/dictionary/afterthought)
- Use hyperspace instead of hyper space (https://en.wikipedia.org/wiki/Hyperspace)
- Use transwarp instead of trans-swarp (http://stexpanded.wikia.com/wiki/Transwarp_drive)
- Use twenty instead of twehty to mean 20
- Use shutdown as a noun, shut down as a verb (https://docs.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/s/shut-down-shutdown)
- Use Every day for a phrase, and everyday as an adjective (https://www.grammarly.com/blog/everyday-every-day/)
- Use elsewhere instead of else where (https://www.merriam-webster.com/dictionary/elsewhere)
- Use led instead of lead when deception led to the destruction.
- Use fourth instead of forth when referencing the next one after the third.
- Use doesn't instead of don't for the third person (http://www.learnersdictionary.com/qa/don-t-and-doesn-t)
- Use nowhere instead of no where (https://www.grammarly.com/blog/nowhere-somewhere-anywhere/)
- Use forty-five instead of fourty-five
- Use better instead of more better (https://ell.stackexchange.com/questions/47284/is-more-better-ungrammatical)
- Use percent instead of precent
- Use overrode instead of over rode (https://www.dictionary.com/browse/overrode)
- Use affecting instead of effecting (https://www.vocabulary.com/articles/chooseyourwords/affect-effect/)

Going by the use of the word arse instead of ass and also bloody which Americans don't use much I would say that the writer is using British English. Which is why discretely is correct.

An enjoyable romp! Suspension of disbelief required. Why would she use vaseline instead of a water-based lubricant? Also, how would coach NOT taste or smell it?

Like your style and reference to foreskin and purple knob, very sexy. However why would he use the dishwasher instead of a washing machine. Great story.