PKM's friends are not incorrect. Traditionally, anything went and it was between man and wife. Not after the sex-crazed 60s and 70s though.
Again in 1971 by Joseph Fielding Smith (Joseph F. Smith's son):
However, many Mormons are not aware of how involved the church has tried to be in people's bedrooms despite not traditionally having "official" policies against certain acts. Come on, was a church and a leader who was married to multiple women, and often without his wife's knowledge, going to be the arbiter of sexual positions and acts? No.
But once the polygamy era ended then the raucous 1960s and 70s arrived things changed. Especially when the seemingly asexual Spencer W. Kimball finally had the final say on all things policy and doctrine. And I would guess that PKM's business partners are in their 40s-60s and were young married couples when their beloved prophet Spencer W. Kimball made statements like these:
Rumor has it that this letter led to a lot of Bishops inquiring about couple's marital acts. Three months later, the church released the following order:
Then in 1998 the handbook for leaders says this:
See https://www.i4m.com/think/sexuality/.
So you have a prophet saying no Oral, but there is no enforcement of it. So although you will never be asked if you have oral sex with your wife, there will undoubtedly be leaders and other members who believe it is an "unholy and impure practice." Additionally, there have been recent talks (I don't want to find the exact quotes) that talk about making sure you do not do things that are "disrespectful" or make your spouse "uncomfortable." I think we all have our own idea of what he's hinting at - and that is a problem. We all have our own ideas. A super conservative sheltered Mormon might think anything other than missionary is disrespectful or it makes them uncomfortable. While others have no such qualms.
Additionally, you are discounting the non-official cultural rules that are passed from a Bishop to newly married couples. Although Bishops are not supposed to inquire into a married couple's activities, they are still permitted to counsel couples about to get married concerning how they should act in the bedroom. I was told not to do anything that would make my wife uncomfortable. Fortunately, my wanky is small enough to fit places that my wife remains comfortable, but that's another matter entirely.
In any case, don't be surprised if you hear older people have opinions about oral sex being against our code while younger people would have no idea that it has ever officially been discussed.
PKM - Mormons vary wildly. I know of some downright freaks in the bedroom who are the biggest prudes socially. I'm sure you probably have met some like this too. This happens everywhere, including with members of the Mormon church.
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POLL QUESTION:
Myself - it was important to me when I got married and I would have not likely ever married a non-Mormon precisely due to the doctrinal reasons for it - achieving salvation/exaltation required a temple marriage (which required both to be church members). Now, I believe differently so it is not an issue at all. I am currently married, but if I divorced or my wife died then I would not care if I married a Mormon or non-Mormon. If they were Mormon though, I would only date less active Mormons or an ex-Mormon. Having a spouse that understands or is familiar with the culture would be nice, but I am not really active in the church and am agnostic in my beliefs so I could not be happy with someone super active or an orthodox believer.
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MORE FUN MORMON QUOTES ON SEX:
Hell, just go read this page if you want more:
https://www.i4m.com/think/sexuality/mormon_oral_sex.htm