This cross-sectional online survey of Polish students (n = 6463) assessed the frequency and patterns of pornography consumption, its self-perceived effects, the prevalence of self-perceived pornography addiction, and opinions on the potential effects of pornography and its legal status. Nearly 80% of students have been exposed to pornography (median age of first exposure: 14 years). Streaming videos were decidedly the most frequent form of use. In the subset of current users (n = 4260), daily use and self-perceived addiction was reported by 10.7% and 15.5%, respectively. The majority of those surveyed did not report any negative effects of pornography use on their sexual function, sexual, and relationship satisfaction. Instead, over one-quarter of students in relationships reported beneficial effects on its quality. The most common self-perceived adverse effects of pornography use included: the need for longer stimulation (12.0%) and more sexual stimuli (17.6%) to reach orgasm, and a decrease in sexual satisfaction (24.5%). Females and males with a Body Mass Index >25 kg/m2 more often reported a self-perceived decrease in relationship quality associated with pornography use. Age of first exposure was significantly associated with reported need for longer stimulation and more sexual stimuli to reach orgasm when using pornography, decrease in sexual satisfaction, and quality of romantic relationship, neglect of basic needs and duties due to pornography use, and self-perceived addiction in both females and males. The highest odds ratios were always observed for age <12 years in reference to exposure at >16 years. In the opinion of most of the surveyed students, pornography may have adverse effects on human health, although access restrictions should not be implemented. The study gives a broad insight into the pornography consumption in young Polish adults.