I think one of the keys to reading Dracula is to accept that he can and does represent multiple fears at once. The tendency to project the fear of sexuality in Jonathan's diary (and I stress that this is fear of same sex attraction when it comes to the Count) creates a blind spot to other readings.
Take this description of Lucy: "She eats well and sleeps well, and enjoys the fresh air; but all the time the roses in her cheeks are fading, and she gets weaker and more languid day by day"
It reads not like a fear of sexuality, but rather as a fear of unknown and incurable illness. Which, given Bram Stoker's unexplained childhood illness, was probably a very present fear for him. Dracula shifts from a figure who represents illness that is able to strike a young person without warning and without explanation.
There is no sexual figure seducing Lucy, there is just the slow decay of health with no explanation, even for someone who is young and has their life ahead of them.