Desensitivity

Hi all,

My name's Mark, and I'm a 19 yr old college freshman and had some questions about sensitivity during sex. I was previously addicted to PMO, but progressively worked alongside my partner to be able to cut porn out of my life; having resolved many of my PIED dysfunctions I was experiencing earlier.

However, what I struggle with now (and sometimes has led to a small period of binging) has been the incapacity to finish in a "natural" way with my partner. Only once have I orgasmed through vaginal sex exceeding 30 minutes, and more often then not I usually finish myself off with some oral at the end, although it doesn't really contribute to my orgasm.

When I do orgasm through my own means, it reminds me and often brings me back to the days of porn, and the twisted associated fetishes. I also did masturbate with the "death grip" for more or less years (from the age of 10 when I discovered pornography). Given all of this, my question is how can I increase my sensitivity (if possible) to be able to a) give my partner the ability to make me orgasm (she isn't at fault, reoccuring issue w/ multiple partners), and b) how to basically reduce my stamina to keep sessions of sex below 45 minutes?

Thanks

 

Ah yeah, not finishing myself would be pretty hard haha, but thanks nonetheless