Sex with my girlfriend?

My girlfriend and I have been together for 2 1/2 months now and we just started having oral sex 2-3weeks ago. It's been the best experience ever considering we are both Virgins. We don't want to have sex just keep on doing oral. She's my first girlfriend, and I'm her first, we are both adults by the way, and we are both very shy about sex. I want to know how girls feel about when a guy touches them and kisses the girls neck, it turns my girlfriend on when I kiss her neck and ears but that doesn't mean I want to take her to bed for some oral. I touch on her body all the time and I get really horny but don't want to tell her directly that I want to have oral with her. How do girls feel about this? Is it okay if I tell her that I want to have oral with her? And I also want to know if girls get horny after coming out for their period? Since she comes out of hers tomorrow. She has been very cranky but sort of intimate the past days.