Sites in this category relate to the historical, anthropological, psychological, political or cross-cultural study of non-sexual personal friendships. Sites in this category will overlap somewhat with sites in the Society : Gay, Lesbian, and Bisexual : History category. The reason for this is that historical same-sex friendships were very intense compared with the modern American variety, and hence are often confused with gay sexual relationships. Owing to the lack of clear evidence about the types of relationships people had in the past, the question of "friendship or romance" is an unresolved debate among those who study these relationships.