What is your opinion on friends with benefits?

I had a guy who was my bestie at high school, and then after that we stopped communication or talking for like 15 years now , He added me through a mutual friend on facebook and he saw me and my pictures and how much I have grown and become beautiful and sexy... etc, he is out of the country and he is coming by the end of the week, and asked me to meet , to catch up ( reunion) after 15 years, problem is he clearly asked me to sleep with him just for sex plain sex, and he can't stop thinking about doing stuff with me, I told him no and I don't want to do that but he keeps nagging every day, and I don't know what to do, I have been single for a while now almost a year and I actually do miss having sex but yet I didn't think of doing it with my school friend, like we used to have an innocent relation ship

What is your opinion on friends with benefits?
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