Can sex with an uncircumcised penis cause yeast infections on females?

My wife gets yeast infections if we have sex a few days in a row without a condom.  My wife is overweight and she is concerned that is what causes the yeast infection.  I am uncircumcised and I think that may be the cause especially since she does not typically get yeast infections when I where a condom.  I clean my penis daily but if I am the cause, I am considering a circumcision.  Can being uncircumcised cause a female to receive yeast infections?  Are overweight females more likely to get yeast infections?

[doosy]

A related discussion, uncircumcised was started.