Can’t orgasm as intense as I used to

I know this sounds weird, but my orgasms aren’t as intense as they used to be. I’m 28 years old - could it be because I’m getting older? I’ve also been taking 100mg of Zoloft for a couple years now. Could that be why? It just sucks cuz I want to orgasm but I can’t get the full satisfaction as I used to. Any suggestions?