Perhaps you missed the last line of the article:
"Whatever ingredients determine a person's sexual preferences and marital choices," conclude the study's authors, "our population-based study shows that parental interactions are important."The above conclusion states sexual preferences and marital choices are affected by parental interactions. That is, environment is a major factor in determining sexual preferences and any argument to the contrary is an argument not held by any credible scientist. Futhermore, there is no evidence supporting a congenital theory for sexual orientation and no credible scientist states otherwise.
I have always thought homosexuality, in most if not all instances, was explained by environmental and not genetic factors. The left of course would have us believe it's genetic, perfectly natural, and thus there is no cure.