[BornAgainBibleBeliever514]

I highly doubt that "plowed with my heifer" refers to any sort of sex act whatsoever. Samson was calling the obvious, that they had used his wife against him.
Since there is no mention whatsoever of the Philistines having sex with the wife (nor yet Samson), but rather threatened her with burning, there is no way to extrapolate a sexual metaphor.
Now I know that in modern-day slang the term "to plow" can be used in an ugly, sexual way, however there just isn't any reason to read that into Judges 14.

Ironically, an heifer is a young cow that hasn't yet given birth, which can depict a newlywed wife. (Not what I'd call my wife, but...) Also, Numbers 19:2 and Deuteronomy 21:3 refer to an heifer as normally being destined to the yoke (unless offered for sacrifice). Now was Samson also implying that he is yoked to her? I'm not sure. She was outside of Israel, yet it was the Lord's will. I doubt that is good grounds to sanction lopsided relationships/marriages.

The Judges 14 passage has nothing to do with sex acts, although it does lend a bit of credibility to "being yoked" referring to marriage, although the initial scriptures given for a difference between being yoked and being joined are still evident as well.

I've heard 2Cr 6:14 used so often to come against lopsided relationships, I'm interested to see how this plays out.