Hello, G123,
It seems that you still have sensation in your family jewel(s), even though erection might be difficult to achieve. There are providers out there who just love to give BBBJ's, erections be damned. If you inform them of your specific issue, they will happily suck away, as long as you enjoy the activity itself. Then there's good ole' 69, of course. And anal rimming, if you should be so disposed.
Yes, you are right - most of this involves fingers and tongues. But why not get some sex toy, like a juicy vibrator, and use on your lady of the moment? While she fellates you? She can also tickle your penis with a feather.
The most important thing is that you do climax. In fact, you may be doing some providers a favor by NOT having an erection. Yes, I know, it sounds strange, but some women, providers included, may actually prefer endless foreplay and a minimum of penile insertion. Some women do not climax vaginally at all. They are 100% clitoral, and for them, a guy equipped with fingers and tongue like you is the ultimate dreamboy.
Just as an aside: In my professional travels, I have observed the whole ordeal with vacuum penis pumps etc. Quite frankly, my impression of it was a 'big Eros killer.' Unless it's very important to you to present an erection, I'd stay away. It looks oddly mechanical, almost brutal, and the effort is anything but romantic. So I'd say, enjoy your clean climax for all its worth. Providers will too, I guarantee it.
Come together,
the Love Goddess