Threesome advise?

Shayla • FTM mom, married to a chef, loves food <3

So my husband and I are both definitely into having another woman join us sexually, boundaries have been talked about and all the good stuff. I'm just nervous that she will be attracted to me after having a baby, I had two third degree tears and have some scar tissue and have a little more lip down there than you see in all the porn with the chicks with perfect peaches. I just don't want to surprise anyone with something they don't like. I want the third to enjoy me as much as we enjoy her, or what if she's not to appetizing in the nether regions, how do I go about telling a girl maybe we should shower before the fun. I just want everyone to be clean and happy.