First of all, I know a lot of people will say to tell her/warn her. But I'm not going to blow the opportunity. I've wasted enough time already. I'm over 30 and I'm pretty sure it would just be too weird for her that I'm still a virgin. I also think it would be kind of emasculating to tell her. So don't bother suggesting that, it's just not going to happen in my case. If she does catch on to the fact that I'm a virgin, I'll deal with the consequences.
I have read plenty about sex. I certainly have a good idea of the basics of what I'm supposed to do. I'm not going to skip foreplay, I know where the clit and vagina are, and I think I know to try to pay attention to her responses and try to adjust accordingly.
Also, I believe I have good control over my orgasms. I don't think I'm going to ejaculate immediately or anything. I think I should be able to go as long as necessarily, to hopefully make it worthwhile for her. I'm also in decent physical shape. Over the months we've been talking, we've also talked a lot about what she likes sexually, so I'm somewhat forearmed.
I don't expect to necessarily blow her mind (and hopefully she doesn't either, she knows I haven't been sexually active in at least a couple years), but I'd like it to be at least enjoyable for her and I'd like to be able to come off as a guy with a normal level of sexual experience or competence.
But what are some less obvious indications that a guy is a virgin? What sorts of awkwardness or fumbling should I be aware of and try to avoid? What sorts of movements do I need to be able to do (and what not to do)? Anything like this, and anything I may not have thought of.
Also, ideally, I'd like to be able to make her orgasm from sex (which, from conversations, she is orgasmic from penetration with her previous partners and it usually happens for her within 5 to 15 minutes of penetration). Feel free to tell me there's no chance of that if that's what you believe, but I'd also appreciate detailed thoughts on what some of the specific differences between a virgin and a more experienced male would be that would reduce the odds of this (beyond the obvious not lasting long enough).
tl;dr: I'm a virgin. I'm not going to tell her. I would like pointers and suggestions on things that may be less obvious but that I should be aware of so that I come across as reasonably competent and experienced sexually. And what are some specific things that would make her know something is off?