I always cum but I always use a vibe so I guess extra stimulation. I just can't finish from penetration at all, have to have clit stim. I have tried so hard to cum from just sex no clit touching ( having ten years with my hubby), doing it all different positions using just fingers or vibe inside I just cant get over the plateau with out clit stim. some say it's psychological, maybe it's a mental block or maybe it really just doesn't work like that for me, but I keep trying when I get a good chance to and maybe some day that will change. our bodies and minds continue to change as we age so just cause it doesn't work now doesn't mean it will never work.
I just try to have fun with it and see what happens