I'm married to a woman, possibly bisexual, and I'm going to buy a dildo to use in secret.

So I'm married, never been with a guy, but I started putting things in my butt starting around age 14 or 15 while in the shower. I've always been super into it, and I once bought a dildo and used it, but threw it out before my wife got back from a business trip.She's going on another one in about a month and I want to get a 9 inch dildo to use whenever she is out of town. I have a spot where I can hide it where I know for a fact she will never find it.Since I'm planning to use this pretty regularly, anything I should know, safety or health-wise?And no, coming clean to her is not an option. She would never be okay with it.