Dissolving into each other

My favorite funny Valentines.

left column top to bottom: Centrophryne spinulosa; cryptopsaras couesii; himantolophus appelii; diceratias trilobus; Bufoceratias wedli; right column top to bottom: Bufoceratias shaoi; melanocetus eustalus; lasiognathus amphirhamphus; thaumatichthys binghami; chaenophryne quasiramifera.

Anglerfish sex is a first date for life, with an organ transplant (the organ being the entire male individual) via tissue fusion onto a female entirely absent the typical vertebrate immune system to boot!