i totally agree.
you're 12 years old, and walking on the edge of a dangerous cliff. you think it's "fun" to get guys hard, whatever. i wish i could sit with you face to face and explain how different guys think from girls. what you are asking in many of your posts, coupled with your lack of knowledge and your age...jesus that all makes for such a dangerous situation.
please, please...read what some of us have told you. talk to a counselor at your school or something. you are so precious, and the road you seem to be taking is filled with pain that will haunt you for a long time. your "fun" will bite you in the ass big time, for the simple reason that guys your age and older don't THINK the way you do.
maybe you feel that power by being able to arouse them. i understand that. it's easy and fun. for the moment. but the backlash is very, very bad. from the basic "she's a cock tease" to "she's a slut" (even if you didn't really do anything), to the ultimate: you tease the wrong guy or group of guys for too long or in the wrong situation and you get raped. regardless if it is actual penetration or head or super heavy petting...it happens. you think you're doing one thing and the recipients read it totally differently.
are you strong enough to say no? strong enough to stay stop? even if you THINK you are, will they??? that's the problem...you NEVER know. you think you know, but really, someone above said a very true fact: the majority of women who are raped are raped by someone they know...something like 90%.
aside from all that, how do you want people to think about you? i'm not talking about the superficial crap like "she's cute", or "she's got a great bod". but the stuff that really counts. what kind of person you are. how good of a friend you are, how good of a human being you are. as much fun as you think what you are doing or want to do is, it reflects badly on you. regardless of what your peers think is "cool" or "hot" or whatever...deep down they think differently. really. think about the coolest kid you know and really analyze why. what makes them "cool" in your mind? is it something really great, like they can sing beautifully, or they are a terrific artist, or they are funny, or they are a wonderful loyal friend? is what makes them great something tangible, something to respect?
anyone, i mean *anyone* can be "cool" because they do sexual stuff, or because they do drugs, or cut class, whatever. but think about why that is cool. it's only cool because it's destructive to yourself, and because others are too chicken to do it, and really, because others like to GOSSIP about it.
don't sell yourself so short. it's fine to learn about sex and how to do it and how to please your partner etc. But you are really, really too young to actually be doing any of this, even if it is "just for fun". Ask all your questions, learn, etc. But please, focus on learning about yourself, cherishing yourself, respecting yourself and growing up.