If you think love is a dead end, it might be that you are picking dead end partners. I need help to be faithful to him. Girl, if you can't be faithful to a guy you think you love, you have a definite problem. You may be a little bit sexually compulsive or you are feeding your vanity with all these sexual conquests, but you will end up alone or feeling used. I would definitely see a counselor about this.
Oral stimulation is the most stimulation there is.
It is very focused and directed. The tongue is much more dexterous than the penis, so what you need to work with her on is what is called bridging the orgasm from one type of stimulation to another. A therapist could probably help you with this in one session. It is either your problem that you are keeping it alive or it is your girlfriend's problem that she is keeping it alive. It is hard to predict if a cyber affair is going to lead to a real affair.