Bronze cory pair?

[normal9]

Hi all I have 4 bronze cory fish, not sure of the sex and I'd like to know their pairing behaviour?

2 of them are constantly together and seem to be kissing each others heads lol is this a sign of a pair?

 

[CraigRets]

Not sure about breeding them but females are a little fatter, (wider from top view)

 

[Aquamandan]

Awwww, your corys are in love.

 

[bettaowner]

Corydoras mate by forming a T on the glass or plants and scatter/ attach their eggs to various items.

 

[normal9]

Thanks for the replies. I really hope they breed