What can I do and not do when including these in our relationship? Movies don't help at all, although I did come across thelazygenerationuk's youtube vidoes where the girls get to slap the guys-feels quite empowering ;)
I love it when my OH plays with mine, she starts off with gentle fondling and moves on to more of a tug/stretch of them. I always let her know if it is getting painful and then she goes back to more gentle play, but it does make me come quicker when she plays with them. She has sucked them which was very intense. Different positions let her have better access to them and I find if she is in the mood to play with them, then she reaches around and has her fun. She finds it a turn on for her just as much as I enjoy it. Just make sure you both communicate about it.