To enjoy sex life is to suck one's own blood, and there is not much more to be explained in this connection. The camel also sucks its own blood while chewing thorny twigs. The thorns the camel eats cut the tongue of the camel, and so blood begins to flow within the camel's mouth. The thorns, mixed with fresh blood, create a taste for the foolish camel, and so he enjoys the thorn-eating business with false pleasure.
A person who wants to enjoy family life or the worldly life of so-called enjoyment is compared to the camel.
The ass works very hard and carries burdens of the maximum weight without making profit for itself. The special qualification of the ass is that it is very much accustomed to being kicked by the opposite sex.
The so-called advancement of human civilization has engaged a human being in the work of an ass. The laborers in great factories and workshops are also engaged in such burdensome work, and after working hard during the day, the poor laborer has to be again kicked by the fair sex, not only for sex enjoyment but also for so many household affairs.
So Srimad-Bhagavatam's categorization of the common man without any spiritual enlightenment into the society of dogs, hogs, camels and asses is not at all an exaggeration. The leaders of such ignorant masses of people may feel very proud of being adored by such a number of dogs and hogs, but that is not very flattering.
The Bhagavatam openly declares that although a person may be a great leader of such dogs and hogs disguised as men, if he has no taste for being enlightened in the science of Krishna, such a leader is also an animal and nothing more.