There's lots of different courting behaviours & 'rituals' among lizards. Lots of species bob their heads up & down, & display their dewlaps. Several other species, including agamas & chameleons, move their front leg up & down or in a circular motion. Some lizards are known to bite the other in the work of courtship. Lizards seldom eat while courting, with minimal drinking as well. This is normal & you ought to not be concerned if the lizards are kept healthy. After mating takes place, the lizards will eat at a slightly accelerated rate.
Mating
All male lizards have a skin flap at the base of their tail, covering what is called the cloaca. The sexual organs are concealed within the cloaca. They have paired organs, called hemipenes. They are within the ventral portion of the tail, covered in sheathes. A vans deferens connects each testicle to of the hemipenes. The lizard's testicles can be found inside the body.
At this point, the sperm will travel through the penis, along the hemipenes' channel, to the females cloaca. Fertilization occurs when the sperm enters the oviducts of the female. Some species of lizards, as with Veiled Chameleons, can store the sperm for later fertilization without the necessity of a male.
The huge majority of mammals mount their mate from behind, which is not true of lizards. It is actually impossible for a lizard to mount their partner in this fashion. Male lizards will approach the female from the side, with lots of biting the neck of the female, & try to get their cloaca in a position as close as feasible to the female. At this point, the closest hemipenes is erected. The hemipenes of lots of species of lizard is adorned with thorns or 'hooks' of some kind, securing a hold in the work of mating.
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