This chapter explores the cultural determinants of internet infidelity using Hofstede's criteria for measuring cultural differences across nations. Hofstede identified the determinants of national culture and formulated indices that allow the estimation of cultural differences among countries. In this chapter, we examine differences among countries with regard to the following indices: power distance, individuality, masculinity and femininity, uncertainty avoidance, long-term orientation, and indulgence. We correlate these indices to understand and compare the following pairs of countries with regard to internet infidelity-China-India, USA-Canada, UK-Finland, and Brazil and other Latin American countries.