Conreception

Me and my boyfriend have been together a bit over a year now, we are both 18 and love eachother very much, but we don't use protection. I'm am going to get the marina put in, in the next few days, as we are going to a private doctors it's going to cost me around $150 
Now I'm stuck between asking him if he could pay some as I'm getting it for him, or as its my body I should pay the total? 
Help! What's the right thing to do??