The answer to this question depends on which version of Loki you are referring to.
Loki in Marvel Comics
In Marvel Comics, Loki's sexuality has been explored in different ways over the years. While there have been no explicit romantic relationships with men, there have been hints and subtext suggesting potential attraction or romantic interest. For example, in the 2011 series Journey into Mystery, Loki's relationship with the Frost Giant, Thorin, is often interpreted as romantic by fans. However, the series never explicitly confirms their relationship.
Loki in the Marvel Cinematic Universe
In the Marvel Cinematic Universe (MCU), Loki's sexuality is not explicitly addressed. While he has been portrayed as having a complex and often antagonistic relationship with Thor, there is no indication of a romantic relationship with any men. However, the MCU has been increasingly open to exploring diverse representations, so it is possible that future storylines might explore Loki's sexuality in more detail.
Overall, there is no definitive answer to the question of whether Loki has dated a man. The answer depends on which version of Loki you are referring to and how you interpret the available information.
