beginning sexual intercourse will depend on your partner's choices, and, yes, I see you are trying and doing what your partners expect, and that's good, because he has NO excuse to say he's not satisfied.The first thing you might want to know if why you always en up un top. This position is usually used to start penetration. We men prefer it sometime because last longer, we can endure more time without ejaculating. Another reason is that, women tend to reach climax faster in this position. Another reason just might be that you have a lazy partner. You know him better then himself, so, that's up to you to judge.I just might guess that if he is the lazy type, he wants to make you come, and get to sleep or watch Tv. Or, another reason, and a very significant one, is, that this will be the position preferred by someone who feel insecure to preform adequately during sexual intercourse and wants to take a way that he feels sure will get him to destination climax. One again, you might be able to answer that question for your self. And, finally, another reason might be all the above mentioned reasons.Other good positions that we men love: doggy and variations of doggy.If you want to encourage your partner to take the initiative to sex and, to want it more and more, just make him feel he's a great lover. If he likes it naked, please him,but during sex just tell him he's the man, he does it the way you like it, that he's huge, that you want him, that he's your daddy! build him up, talk dirty to him. He's trying to tell you "Love it when a woman shows she wants it..." so, show it, and then see if he responds... If he doesn't respond, then, HE is the problem, not you nor your lingerie.I wish you all the best, come back and tell us how it went.....