Can you give me an example of a 14-line sonnet about love?

The most famous love sonnets in English are those by Shakespeare (though there are many more).

Among his best is Sonnet 130:

My mistress' eyes are nothing like the sun; Coral is far more red than her lips' red; If snow be white, why then her breasts are dun; If hairs be wires, black wires grow on her head. I have seen roses damasked, red and white, But no such roses see I in her cheeks; And in some perfumes is there more delight Than in the breath that from my mistress reeks. I love to hear her speak, yet well I know That music hath a far more pleasing sound; I grant I never saw a goddess go; My mistress when she walks treads on the ground. And yet, by heaven, I think my love as rare As any she belied with false compare.