I'm going to assume that you are old enough to be in an adult relationship when responding to your question.
My opinion is straight men, don't typically want gifts for Vday that doesn't involve sex. Not just the same ol sex you always have, but do something different to mark the occasion of Vday. He probably took you to a nice dinner, got you some small but nice gift of flowers or something... so you should:
- wear new sexy nighty to bed, and/or;
- wrap a bow around yourself, and nothing else, when you come to bed (my personal favorite). This indicates that you are his for whatever he wants. For example, my wife and I have a few unwritten lists. One is a "never" list (most of these are things I'd never want to do either) and another is a "special occasion" list. This one is stuff (positions, acts, etc) that either aren't her favorite thing or doesn't really enjoy - but I do.
The bow indicates we are playing from the "Special Occasion" playbook for the evening - for as long as I can last (which sadly is never as long as I hope). At three months, you may or may not have established these unspoken lists yet... or are still in the stage where you are doing everything because you want to be the "cool chick" so this may not work for you yet.
- Maybe role play. (Dress up like a naughty teacher, or nurse, or whatever. Pretty much just get out your naughty Halloween costumes and go with one of them) My wife and I tried this once and both of us just thought it was stupid, but some people really dig it.
- Different location is always a treat too. If you guys typically have sex in the same place.... surprise him by getting things going somewhere that he doesn't expect.
- Love coupon book. This sounds corny - but it's fantastic - and is actually a present you can wrap, so you might like that. It's pretty much the "special occasion" playbook again in the form of a coupon book. He can cash in these coupon's throughout the year and you pretty much need to accept them (no "I'm too tired", or "not tonight") when the coupon comes out. Unless he's a complete dirt bag, he won't spring one on you when you are sick or have to be up super early the next day.
- Etc etc. There's a buch of different stuff that you can do to make sex on Vday differet than the sex you normally have - unless you guys are just all out all the time. For me, I don't want a new garage tool on Vday. Or a sports shirt, or a Blu-ray... Those are bday presents and Christmas presents. Vday for guys, in my opinion, is about sex. That may come off sounding like a typical pig-guy thing to say. But it isn't. It's a compliment to you, the ladies, that YOU yourself are the gift that men want.
Happy Valentines Day. P.S. If you are my daughter, forget everything you just read and get him an air freshner for his car. Solid gift idea.