תרגום - רוסית-אנגלית - Любовь зла, полюбишь и козла.

I think it would be appropriate to give also the literal translation, for the difference between the russian proverb and the English analogue is too big...

That is so difficult, but I'll try.

"Love is evil, you may fall in love even with a donkey".

Evil or bad - adjectives.
Donkey - both for animal and man. Literally - goat.