Turn down the lighting, put on the Barry White and lets get jiggy with it. Not exactly how a nudbranch mates so lets have a look at what they do to reproduce. To start with its not like they need to find a mate of the opposite sex as they are hermaphrodites. There are limits on how much we know about mate selection, is it looks, personality, a gold-digger or just after a one night (actually closer to one minute) stand. Either way on finding the mate they need to get into the right position. So what is the right position? They are not overly adventurous with both having a gonopore on the right hand side of the body.
The starting point is side-by-side and begin to position themselves for the turn. Perhaps this is the smooth talking stage with some light petting.
The nudibranch at the top was the instigator here and began turning to the right, sliding over the head of the mating partner.
With the turn being complete they line up to commence mating and the exchange of sperm through the gonopore.
Once the act has been completed they separate ways, no exchange of phone numbers, no selfies together and definitely no meet the parents to worry about.
