Well, we can start with the apparent fact that you think pictures of a penis are important - they aren't. So, what is important? If you're old enough to know who Stephen Stills is then you should already know the answer - 'Love the One You're With'.
Or, to put it another way, pay attention to the person you are having sex with, because women are not one-size-fits-all toys. They are individuals with individual needs and preferences. Some may be less willing to express those to you than others, but that has no effect on what is true.
Now, generally speaking, I suggest that if your partner is not happy then encourage your partner to lead the dance. As it appears that you've hit on a method that does make her happy then rejoice! And continue to give her the opportunity to take the lead.



