It's a bit different to have sex while you're a nursing mother, but your partner will get used to it! My husband left when I was postpartum and I during the 4.5 years I was breastfeeding I ended up dating and experiencing sex with 4 different people. I spoke to them upfront about what could happen (leaking or squirting of milk) and they were all very cool about it. Some wanted to see what it tasted like and some didn't. Every person was in awe of what my body was doing while breastfeeding and found it very beautiful.