There's no golden rule of lesbian sex, any more than there is with straight sex. Everyone has their own desires.
Lesbian sex basics...
However, understanding the basics will help ensure you have the most satisfying time ever.
Don't assum
Every woman is different. Some like manual stimulation, some find oral the most satisfying, some like toys (including strap ons), some like it all. Just because you like something, it doesn't mean a partner will so communicate and explore together.
Be protected
Oral transmission of Sexually Transmitted Infections (STIs) are on the increase, so use a dental dam (latex square) to stay protected unless you've both been tested. STIs can be transmitted through sharing toys too so use condoms if you share.
Be sexy
There's no need for protected sex to be boring. Try ribbed, dotted and other sensation-changing condoms on toys to ring the changes. Dams are available in different flavours as well as plain varieties too.
Play nice
Try using a pleasure ring on a dildo to add clitoral stimulation. Use a bullet vibe during oral or simply dress up for each other. Ring the changes to keep things fresh.
Try approaching from a different angle - it can totally change the sensation.
Be secure
Most women worry about their bodies but if a woman wants to get intimate with you, she likes what she sees. Be proud of the way you look and revel in her gaze.
Explore with oral
Try approaching from a different angle - it can totally change the sensation.
Use lube
Great for massage and fingering, lube is also essential if you want to explore anal play.
Find different ways to play
Try different oral techniques and ways of using your hands to pleasure your lover
Masturbate together
That way you'll see what you both enjoy.
Know your limits
Sex isn't about endurance. If a partner suggests something you find intimidating, be honest. Use your hands to guide your lover and control the pace when you're first exploring.