We don't need condoms anymore but I used them throughout our earlier life when my partner was still worried about making babies...actually until only a few years ago. Note condom discussion here relates to disease free people using condoms for birth control only.
They were the bane of my sex life for a long time.
I experimented with two types, the rubber ones and the plastic ones. For some reason, the plastic ones felt better (meaning more sensation) but where terribly expensive and slipped off far more easily. I forget the brand now. Occasionally I had to go into her vagina fishing out a condom that had come off, and she was a little panicked about becoming fertilized.
Pretty much for all this time condoms did provide the birth control we were seeking and we avoided (to me) more dangerous solutions such as pills or (gasp) vasectomy or IUDs.
But bottom line, condoms are a problem sometimes.
When you go soft, you have to withdraw and put on a new condom once you get hard again. Or else the condom tends to slip off. And, condoms really interfere with sensation and make penetration a little more difficult.
And condoms lend themselves to quicker intercourse. You get really excited, get the condom on, penetrate, and come. Prolonged and more loving intercourse was always harder to achieve for me with condoms -- I would do better with condoms when I went into an erotic boil quickly and reached orgasm quickly.
Although at times condoms were fine and I wondered why it was ever an issue. I'd put it on, enter her, and be fine for a long time.
Now that I'm practicing Karezza I'm grateful that I don't need to use a condom anymore. I can't imagine using them at this point, to be honest.
But if I did have to, here is something that I used to find useful. Occasionally I'd have a bout of difficulty with my erections. Anxiety. Whatever. Then I'd look forward to when my partner had her period. Then I didn't need a condom and could "practice" and not feel anxious. During the heaviest two flow days we would forgo sex but the rest of the time, I didn't mind a bit of blood and it was well worth not having to think about using a condom.
If you're having some anxiety after rebooting, you might find this useful to get things going again without having to worry for a few days about a condom.