Don't think the Mojo has anything to do with breastfeeding, some women lose it after birth, some don't.
I've been breastfeeding for almost a year now and have no problems in the mojo department, but I know bottlefeeders as well as breastfeeders who do.
I think one thing which helps though is trying to keep looking nice, dress nicely, put some make up on, even if you're only going to the baby group or the supermarket. Not for him, as such, but so you feel good about yourself.