"He Went In To Her"

Both First Corinthians chapter 7 (verses 1 through 5) and First Thessalonians chapter 4 verses 4 through 7 relate to sexual-oriented activities between a man and woman.

I Corinthians 7:1 says it is good for a man to not touch [Gr. aptesthai] a woman (and that exactly-spelled-the-same Greek word is found in Luke 6:19 relating to people wanting to "touch" Jesus) - to avoid fornication.

Verse 3 goes on to state that the husband should "render" [Gr. apodidot(o)] (no other occurrence of this word in the New Testament!) his wife "due" [Gr. opheilom(e)n] (no other occurrence of this word in the New Testament!) "kindness" [Gr. eunoian] (no other occurrence of this word in the New Testament!)

Verse 5 tells both to neither "deprive" [Gr. apostereite] the other (with only one other New-Testament occurrence of this word in I Cor. 6:8 apparently relating to lawsuits), but then "come together" [Gr. sunerch(e)sthe] "on the same" [Gr. epi to auto]."

First Thessalonians chapter 4 verse 4 tells us to "possess" [Gr. ktasthai] his "vessel" [Gr. skeuos] in purity and honor, and (verse 5 continues with) not in "passion" [Gr. pathei] of "lust" [Gr. epithumias].

Verse 6 adds that we must not "go beyond" [Gr. uperbainein] and "overreach" [Gr. pleonektein] against our brother concerning that.

Within the first 8 books of the OLD Testament and only those), a few references state the phrase:

..."...he went in to her..."

Exact references pertaining to such are:

Genesis 29:23 (referring to Jacob [sexually] going in to Leah)
Judges 4:22 (referring to Sisera possibly-nonsexually going in to Jael for drink)
Judges 16:1 (referring to Samson going in to a harlot in Gaza)
Ruth 4:13 (referring to referring to Boaz [sexually] going in to Ruth)

Scripture Text (in at least the English translations presently and commonly available) is not explicit HOW those men [sexually] "went in to" those women mentioned.

For instance, it does not elaborate on whether the "going in to" related to the woman's bedroom, bed itself, or whatever private-part openings of her body a man's extended private part could enter in whatever aroused or non-aroused condition.

If the Hebrew Text specifies precisely how the man entered the woman's body, it is not known by the English-worded translations if he entered her mouth, vagina, or rectum. That is left to the imagination.