I wanted to answer these questions for you too but I couldn't remember them when writing my last post...
Why do guys like oral? This really depends on the guy and a basic principle. We like things that feel good and touching certain pleasure zones in certain ways just makes you feel good. It's like when you open a bottle of wine and you see all these bubbles. It feels like yummy bubbles running through your body. Same as when a guy performs oral on a girl. Hit a pleasure zone the right way and boom yumminess. While basically all guys like oral and it can create a reaction in the body not make is turned on by it. Some men get turned on by turning you on. So oral is not really something you have to feel obligated to do. You can either talk to your partner ahead of time or they might clue you in before hand but the choice is always yours and you should be comfortable.
How long in your opinion should you be together before you have sex!? Everybody will give you different answers on this but truthfully you'll know when you're ready. It may be one week it may be one year it may be longer. The best time to have sex is when you are 100% comfortable with that person.
For me I always thought I was going to wait till I get married or at least until I had that long term relationship and we loved and cared for each other deeply but I ended up having sex with very fast with someone. We had this instant physical, emotional, intense mental attraction. It was very animalistic to say the least. I never in my wildest dreams anticipated stepping away from the morals I set for myself but with him there was no question. The first time we had sex it was and wasn't planned. We joked around and it was very relaxed and it just flowed naturally. He made love to me and he took care of me. My body language told him I was nervous but he didn't know why till afterwards. Mentally though I wasn't nervous I was lost in passion. I didn't have to do anything I didn't want to and I never felt pressured too. He was consistently making sure I was ok and kept asking if I was this was ok. Not because he was inexperienced (let me tell you he wasn't) but because he cares about me. He just wanted to please me and that's something you don't find often.
That's how you'll know when you are so relaxed and comfortable and you're filled with this intense passion for a person.
I will say this though don't confuse passion for lust or infatuation. There is a difference and you need to be able to recognize it in yourself first.
I hoped some of this helped...