In some respects the use of sexual obsessions as a subject for literature resembles the use of a literary subject whose validity for fewer people would contest: religious obsessions. So compared, the familiar fact of pornography's definite, aggressive impact upon its readers looks somewhat different. Its celebrated intention of sexually stimulating readers is really a species of proselytizing. Pornography that is serious literature aims to excite in the same way that books which render an extreme form of religious experience aim to convert.

The Pornographic Imagination, pp. 47-48. - Styles of Radical Will (1966)