It's easy to spin a romantic yarn while speaking in French, and you'll be glad to know that you won't have to learn the language in its entirety to mouth a few phrases. All you need to do is keep a couple of grammar rules in mind, go totally soft on the consonants, and never, ever pronounce the last alphabet of a word, unless you see an accent on it.
Ready to roll? Here's a bit about the grammar bit.
Each term is preceded by a possessive adjective, which is either Mon (masculine) or Ma (feminine). In case you're addressing more than one person, it is Mes, irrespective of the gender.
The possessive adjective used should agree with the gender of the person you're speaking to, and not your own. For instance ...
... if you're a woman addressing a man as 'my darling', you should say,
... if you're a man addressing a woman as 'my darling', you should say,
Note that the term of endearment also changes according to the gender. 'Chéri' is masculine, whereas 'chérie' is feminine. Fret not, we'll be listing all the terms according to the gender they apply to, and there's no more grammar to be hassled with.
These are unisex endearments, basically. So you can use them, as they are, to address your boyfriend or girlfriend, husband or wife, even though they have a masculine possessive adjective.
These terms should come in handy for women wanting to cheese out their male partners. If it helps, bring along a baguette and some fromage, create an atmosphere, and ease your man into the French talk, lest you scare him away.
Nothing warms up the cockles of your woman's heart as hearing these soft French endearments. However, note that simply saying them right won't do. If you're looking to score some brownie points, you've got to say it like you mean it.