Is it normal that my gf lets me do what i want

So I've been with this girl for about 4 months, and I've discovered, over several encounters that she will never deny me sex or oral sex. We can literally be wherever and all I have to do is push her shoulders down. She could be reading a book, watching tv, painting, we could be driving in my car. it doesn't matter. All I have to do is whip it out and push her to her knees, grab her head and force it in and she takes it and asks for more. Not only that but I can also come up behind her, bend her over pull down her pants down and have her whenever I please, not once has she ever denied me, or told me to stop. I'm really trying to see how far I can take this, public toilets, daylight traffic while driving, swimming pools, Family functions but it just seems like i can have her anytime any place. I'm thinking I've hit the jackpot here, so I'm wondering, is this normal?