Iceman's sexuality is revealed for the first time in "All-New X-Men" No. 40.
The character has been part of the "X-Men" since the beginning in 1963.
Iceman has appeared in animated series and "X-Men" movies.
The current storyline in "All-New X-Men" has the characters traveling back in time, inhabiting younger bodies.
Mind-reading mutant Jean Grey tells Bobby "Iceman" Drake that she knows the truth about his sexuality.
Jean Grey asks Bobby why he calls women "hot," when she knows he is gay.
The issue is released in stores on Wednesday.
Writer Brian Michael Bendis wanted to portray the struggles of people hiding their sexuality.
For many years, "X-Men" has been seen as an allegory for racial and now LGBT struggles.
Bobby is not willing at first to acknowledge what Jean knows about him.