With same-sex marriage becoming law throughout the land, the question for the mortgage industry is how this would help the housing market. There is very little market research on homeownership rates among gays, lesbians, bisexuals, transgender and same-sex couples. But a recent survey by the National Association of Gay & Lesbian Real Estate Professionals found 54 percent of LGBT respondents own some type of real estate and, of those, 8 percent own a vacation home. In…