Nursing and sex. Of course, every woman is different, and many nursing mothers report that breastfeeding doesn't affect their libido one way or another. Some even feel more sexual than their bottle-feeding peers, finding breastfeeding an extremely pleasant, and even sensual, experience that can translate into amorous feelings for their partner.
Yes. Breastfeeding is a big part of a new mom's daily life, and does influence her sex drive. The influence can be for the better or for the worse, depending on many, many factors (such as her views on breastfeeding, how easy or hard it is for her to breastfeed, her body image, her relationship with her husband, etc. . ..).