Not necessarily. Normally a pairing will not leave each others' side for long and almost always return to each others' company (after feeding, etc). If there is actual mating and gravidness, the doctorfish delivers the fry (not french or freedom) or sometimes a magical pink storkfish will drop a 400+ egg bundle into your clownfishes awaiting fins...or if they are unlucky the overflow. Some clownfish will never pair, but will tolerate each other and have separate territories.