In addition to the other responses, SSA may sometimes be manifested only in intense emotional bonding beyond what would be considered 'normal.'
For example, my father bonded with men (rather than his wife) throughout his adulthood, obsessing on one 'friend' at a time, with a devotion that far overshadowed his relationships with any other person in his life. I doubt his 'crushes' were sexual, but there were no limits to his utter and complete devotion to each man he 'chose.'
I believe SSA is very common in American culture, thinly disguised in marriages where the husband devotes the majority of his time to his friend or friends, so much so that it becomes 'the other woman' and damages the relationship with his wife. Of course, these are always the men who deflect attention by proudly expressing anti-homosexual sentiments.
"A burned bridge can be a gift; it prevents us from returning to a place we should have never been."