ovetous, lustful, show an expression of deep resentment, term of endearment for boys, married couple, spouses
妋 has a scattered set of meanings that do not share one clear center. The main cluster involves strong desire or resentment, with a separate strand referring to a married couple or a term of endearment for boys.
妋 combines 女 (woman) with 夫 (man/husband), which may relate to the married couple sense. The historical development of the other meanings is uncertain.
A woman 女 beside a man 夫 can suggest a married couple. The other meanings (desire, resentment) are harder to tie to the shape; perhaps the woman's expression shows strong feeling.
For フ, imagine a married couple arguing: the wife says 'Foo!' in frustration, expressing deep resentment. Foo -> フ.