The most extensive study on sexual fidelity ever done was conducted in 1994. ( R. Michael, J. H. Gagnon, et al., Sex in America: a Definitive Survey) The researchers found that the vast majority of heterosexual couples were monogamous while the marriage was intact. 94% of married heterosexual couples and 75% of co-habiting heterosexual couples had no partners outside their current relationship in the previous twelve months.
In contrast, sexual fidelity is so rare among gay men that a new term has been offered: “Fidelity without monogamy.” Gay men who were coupled reported that they had sex with someone other than their partner in 66% of their relationships during the first year of their coupleship, rising to 90% of the relationship lasts for five years.
In one study, only 15% of gay men and 17.3 % of lesbians were found to have had relationships that lasted for more than three years.
Read entire article at :http://www.heritage.org/research/reports/2013/09/the-social-costs-of-abandoning-the-meaning-of-marriage
