From your earlier comment:

> It is saying that each of them can use the others body as they like, without regard for the other

This is your own interpretation and it shows your bias. The bible (and I assume other religious texts) is easy to misinterpret due to bias. It's not written like a technical documentation where the tiniest details are specified; thus giving plenty opportunities to subject a text to arbitrary meaning.

This was a problem even in biblical times. 2 Peter 3:16

> as also in all of his letters, speaking in them of these things. In those, there are some things that are hard to understand, which the ignorant and unsettled twist, as they also do to the other Scriptures, to their own destruction.

The solution is study. Not superficially reading and guesstimating, but to study the text itself, the surrounding verses, the context. Who wrote it? Who's the audience? What, more broadly, are they trying to say? Crosschecking with other verses in bible. Things like that (See Proverbs 2:1-5, Psalm 1:2, Joshua 1:8, Psalm 119:97, 1. Timothy 4:15)

Coming back to the text in question (1. Corinthians 7:4). The surrounding verses provide context on what this is about:

> To the unmarried and the widows I say that it is good for them to remain single, as I am. But if they cannot exercise self-control, they should marry. For it is better to marry than to burn with passion. > Let the husband give to his wife her due, and let the wife also do likewise to her husband. > Do not deprive each other except by mutual consent for an appointed time [...].

Put simply: "marry and enjoy sex." That's basically what the apostle Paul is trying to say here. But of course, that alone doesn't debunk your interpretation.

Paul also wrote Ephesians 5:28-33

> In the same way husbands should love their wives as their own bodies. A man who loves his wife loves himself, for no man ever hated his own body, but he feeds and cherishes it [...] Each one of you must love his wife as he does himself; on the other hand, the wife should have deep respect for her husband.

Also vers 25:

> Husbands, continue loving your wives, just as the Christ also loved the congregation and gave himself up for it.

There are further verses, but this comment is getting too long.

Bible as RAG Database