No crude jokes about why they call me 'tripod' but I reckon this is where I get kicked off. You see it's time to survey adult comics.
A ready synopsis is to liken them to mature comics but with the violence, nudity and harsh language ramped up. As much as I'd like to claim that true adult comics are ones that explore complex philosophical issues, I'm afraid 'adult' here means the same as it does in any medium: sex. Diversity is key here as it is any stick book so you will see sodomy, lesbian sex and oral sex.
Though often considered the province of underground comics due to the taboo nature, adult comics also encompass sado-masochism, incest, paedophilia, bestiality, though dealt with in a suitably circumspect manner.
Or whatever tickles your fancy.