In honor of Valentine's day, I present the following curve, described in polar coordinates:

latexr=sin(θ)∣cos(θ)∣sin(θ)+75−2sin(θ)+2latex r = \frac{sin(\theta) \sqrt{|cos(\theta)|}}{sin(\theta) + \frac{7}{5}} - 2sin(\theta) + 2 latexwithlatex with latex0<θ<2πlatex 0 < \theta < 2 \pi

Thanks to Cosmic Variance and Wolfram Alpha.