Verified answer

of course not, dear! Some people just enjoy pairing him up, usually with Sasori. The yaoi goodness of it but it's just that and nothing more, it's completely fan fiction. Deidara just happened Ino's boy version lol!

His kissing men is not canon, it's fan art. Canon wise, it's unknown whether he is gay or straight. But he is made to look and sound effeminate and stereotypically a gay fem. It's like Zarbon, Whis, and Otokosuki in DBZ. The series doesnt come out and definitely say yes or no. But it is heavily implied that yes, without a doubt they are. Usually this is done for comedy, but not so in Naruto. He is also a trap and a bishounen, so he was made to basically be.

So the answer is, if you consider what the series says, then nobody knows. But if you use common sense to take what the series and art is implying, then yes he is.

Look up kabuki theatre history, bishounen in kabuki theatre, and check out Zarbon, and that should help you in case you have questions like this in the future.

I'm 100% sure that it's just fan art, Deidara is not gay, he's just a narcissist

I just drew a picture of santa kissing a dude, is santa gay?

Seriously, learn to identify what is fake, real or fan art.

Ive seen Naruto kiss Sasuke, is Naruto gay, no? lol

No he's not gay. Just art work by someone who is gay.