Had my erection go away completely as soon as it was time to put on a condom...i was with a really pretty provider too. I would have no problems getting hard from foreplay/bj/hj but when its time for penetration the erection went away, and no matter what we did I stayed limp...
That has been my situation for many years.... almost. I don't get totally limp, but I usually don't stay fully hard for long either, which your need for penetration. Think it has something to do with covering the sensitive part of your dick with a piece of plastic (latex) ! Seriously condoms are not normal. I have always enjoyed uncovered activities whether HJ, BJ or TF, so never missed FS all that much. A great uncovered service beats covered FS almost every time in my book. Though there were a couple times in Montreal I wished I had Viagra for FS.
Give it a shot but no need for more than 50mg. After you try it once you can decide if it's something you want to continue or not.