In the mainstream comics, Venom's sexuality is not defined as gay. His character development is centered around battles and conflicts rather than his sexual orientation.
It depends on the specific comic and its storyline. Sometimes it might be explicitly shown or hinted at, while in others there might be no clear indication.
It depends on the specific comic and its storyline. Some comics might imply or explicitly show it, while others might not address this aspect of his character at all.
In some comic storylines, Constantine's sexuality is ambiguous or not clearly defined. It depends on the specific interpretation and version of the character.