He's had romantic relationships with women before, with the vampire Camille Belcourt being the one that stings the most.
In the first episode concerning the matter he flatly stated he was "not gay" and did not formally declare himself to be bisexual until Season 7, but even then he did not want to be deemed "a crusader".
In a long-term relationship with Marshall Eriksen, but also expresses attraction to women on multiple occasions, especially about her friend Robin Scherbatsky, and says that one of her life goals before marrying Marshall was to have a "lesbian relationship."Clara Oswald mentions her romance with the celebrated author, stating that Jane Austen 'is a phenomenal kisser'.
Josh later tries to get back in contact with Ben, but he has begun a relationship with a woman, identifying as sexually fluid.
Claire Bennet is shown liking men and being seriously involved with a boyfriend.
This way of treating his sexuality is believed to have made the network uncomfortable.
Ben is a one-night stand of Josh's during the initial stages of his open relationship with Arnold.