Always use clean toys and use a condom on it. Use plenty of lube and go slowly. My guy loves to insert a toy in my anus and loves to have them in him as well. So, if he is rough on me, I can be rough on him. I don't like rough. Gentle is better. I lay on my back or side and he uses the toys on me this way. He like to lay on his back as I use his toy on him and give him a good oral workout. It doesn't tkae long for him to pop this way.
Just be careful. Don't switch and use the same toy on the other without cleaning it and changing the condom. BY NO MEANS EVER pull the toy out of the anus and insert it into the vagina!!!!