Hello again, Tdadamemd. Getting right to your comment about slang, I don't understand your stating that "fuck" is not slang, or your linking to dictionary.com as proof that it is not. The word "fuck," while vulgar, is also slang; the dictionary.com source you cited even states so. It makes it clear that it can be slang for a variety of things, including sexual intercourse/other sexual activity. It list 13 numbered examples regarding what "fuck" can mean. As for Wiktionary, I don't refer to sources like that. And, yes, I am fine with mentioning "fuck" (or "fucking") and the euphemism "sleeping together" lower in the article, in the the Definitions and stimulation factors section, as alternative words for sexual intercourse/sexual activity. But again, there are a lot of terms for sexual intercourse, most of them slang. That these terms exist doesn't mean that all of them should be in this article. In fact, most times when there are many alternative terms for a word, especially if those terms are slang, we don't include all of them. As you know, this is an encyclopedia and not a dictionary. 

If WP:CONSENSUS is achieved for including your proposal, I'll add it by briefly summarizing that there are various vulgar and/or slang terms and euphemisms for sexual intercourse/other sexual activity...such as "fuck" and "sleeping together" (the wording won't be exactly like that, of course). And, really, because there are so many terms for sexual intercourse, and "fuck" is not especially relevant to the topic of sexual intercourse (by that, I mean that most people and sources are not discussing the word "fuck" when discussing sexual intercourse), that is probably why "fuck" isn't currently in this article. Someone who is aware of your having repeatedly added it to the lead expressed to me via email me that "fuck" is also U.S.-centric; so that's also something to think about, though the term is also used outside of the United States. 

Also, sexual intercourse does not = fuck. It's that fuck = sexual intercourse; in its literal sense anyway, since when people use the term...they are usually using it as profanity. That is also why I told you "The Fuck article mentions sexual intercourse in its lead because it is especially relevant to the topic. However, the term 'fuck' is not especially relevant to the topic of sexual intercourse." 

I cannot see how this article is broken simply because it doesn't currently include "fuck." But, like I stated, I don't mind adding it to the article. I'd rather see what others have to state on that matter first, however.