Colby was in his 20s — far too young, according to some, to struggle with this particular thing — when he noticed an issue: When he wanted to get intimate, he couldn’t stay hard.  The now-33-year-old, who, like everyone else in this story, asked Vox not to publish their last name so he could speak more openly about his sex life, was unsure if his issues were truly physical or if they stemmed from something else. He saw a doctor who did some blood work — his testosterone levels, while still normal, were slightly low. A specialist put him on testosterone, but Colby was concerned about...