hmm, my friend ben has had somethign like this happen to him. he and his GF have stated they were BF and GF for a while, but never did anything together. for 2 years, they didn't do anything, an now they do. i asked him for an explanation, and he just said, "because we love each other now." i by "do stuff" i mean "going out."

so, it is very posible.