New Relationship

So any advice is appreciated here.
I'm in a relatively new relationship and we've been taking things quite slow. So we've been going out for about three months and things are going really well, but we've only slept together a couple of times. Both times i finished really early without really getting hard enough to even do anything properly. I don't care about things from my side but i feel like i'm letting her down. I'm fairly adept at making sure that she gets everything she wants out of the experience in other ways, but I want to be able to perform normally in the bedroom
I don't think i'm quite there yet to be able to talk to her about this sort of thing or my current re-boot, so i does anyone have any advice on what to do in this kind of situation?
Any particularly effective techniques to get hard and stay hard?
Should i consider Viagro?
Should i talk to her about the re-boot, and if so how?
Do any of these worries really matter or is it all immaterial so long as she says she's happy?