based on Kosmic Union drawing from 1980s this image has been refined and enriched.
clearly, it's about about male-female alliance, testosterone meets oestrogen at an intergalactic settings. references to genetics, life-cycle, bio-chemistry are many, plus, we see a half-formed foetus quietly sliding in from the right edge of the picture -- charming?

this is Versioned Edition (see above) - personalise it for your purposes, if you wish...