'All the women my friends and I have encountered are submissive, therefore all women are submissive' - that's not decent logic at all, is it.
Most people are going to be dominant and submissive at different times, in different situations. Perhaps you and your friends prefer to be dominant, and so the women are therefore left with submissive roles.
There is so much stigma still around women and sex, we are supposed to be sexually attractive at all times, yet not 'sluts', we are supposed to be available for sex, yet not seek it out for our own enjoyment or want it 'too much' - all of this likely plays a huge role in how any women is going to act with regards to sex.
If the sexist virginal, 'good girl' stereotype is held up as the ideal, well that's a submissive ideal, isn't it. A sexually dominant woman is in danger of being called a 'slut'. Sexism plays a huge part in this.