the first is basically screaming I'm super gay. The second is more just implying the other character being presented a penis not a vagina with direct gay sexual implications, and the last is more subtle but the rainbow underwear still implies the the character is inviting to the viewer or an unseen character gay sexual thoughts or actual gay sex, or in the very least displaying his own gayness regardless of sexual implications or not.

At least this is my interpretation a of these images.