Not all lesbians seek to express their sexuality in purely feminine ways. In fact, a big portion of the lesbian community is into something called "tribadism". Also known as tribbing, it's a practice that involves one lesbian partner taking the position of the male in the missionary position.
The dominant partner then rubs her vulva against her passive partner, seeking to stimulate her clitoris in the process. It doesn't have to be all about vulva on clitoris action, either. The tribber can fuck her partner's thighs, knees, hips - anything they can rub their body against in a standard sexual position.
The term comes from the Greek word "tribas", which denoted a woman who engaged in an unusual sexual activity. At first, this could involve penetrating men or women with sex toys or using her clitoris in unnatural ways.
However, by the modern era, the term had become attached solely to lesbianism, which is how it remains.
If you want to try some tribbing, it's a practice that anyone can enjoy. In fact, in the 19th century, it became associated with working class women, often those engaged in prostitution or crime in general. This underworld link doesn't still exist, but tribbing remains accessible to everyone, which is why it has never gone out of fashion.
Although taking the male role in the missionary position is the most common method, there is other option for tribbing enthusiasts too. For instance, you could try the scissors position, where the two partners interlock their legs like scissors and rub their vulvas together. Doggy style is another option, and you can even try it on top.
So feel free to experiment and find a position that is comfortable for you. Some people even find it useful to combine tribbing with dildos and finger stimulation. There aren't any rules, so just do what creates the most pleasure.
Some studies have found that a third of lesbian women enjoy tribbing on a regular basis as their main means of reaching orgasm - and that's the key to the practice's enduring popularity. Full body contact creates a degree of intimacy and sensation that heightens the sexual experience, allowing many women to reach heights of pleasure that oral sex or toying cannot.
The passionate clitoral stimulation that tribbing provides (when done well) provides a rush of sexual energy that can sweep participants away. Then there's the power relationship. The combination of a submissive female and dominant "male" partner makes tribbing attractive to some people on a purely psychological basis, and turns others off. It's also extremely safe.
There's no penetration and no oral contact involved - just intimate physical contact. So there's no shortage of reasons to give tribbing a try.