How to have an orgasm through intercourse...XXX?

So the only way I can have an orgasm is through clitoral stimulation...I can give myself an orgasm and a guy can eat me out and I'll orgasm. The only time I have had an orgasm through intercourse in when I stimulated my clit but it took a lot longer than it would if I was doing it alone or getting oral sex. My FWB (friend with benefits) said that the last girl he was with would *** like 3 or 4 times before he even did..this made me a little nervous. He said that she would come within like five mins. I don't know what to do...now this has made me a little embarrassed. I don't know what to do...he says just to let go and not hold back..but I don't think im holding back...maybe we switch positions too much...? HELP LOL I want a better sex life.