If you're looking for anime similar to Bikini Warriors Special, you might like these titles.
Haruki spends most of his time with friends and fellow classmates Airi and Ayana. All seems well, that is until Airi and Ayana form separate clubs, the Mechanical Science Club and the Chemical Science Club. The two vie for Haruki's attention and hilarious chaos usually follows all attempts to make him join.
Both are mainly plotless one-episode anime, that are just about girls getting involved in sexual acts. They also both "spice it up" by making them use "aphrodisiacs"...
Over the top ecchi with plenty of fanservice in both these shows. If you enjoy a ridiculous amount of fanservice per episode while not having as much plot, these are a perfect fit. The whole main cast is also female (there's one male in Kagaku no Yatsure that's considered a main, but he's marginal at best) Lastly, Kagaku na Yatsura is equally explicit as Bikini Warriors and containing elements of Yuri.
Some things to keep in mind is that Bikini Warriors is set in fantasy with very minor modern elements, whereas Kagaku na Yatsura is set in modern times with some fantasy elements. Lastly, there is a little bit of plot in Kagaku na Yatsura as opposed to literally no plot in Bikini Warriors (Although there's plenty of "plot" in both).
Dr. Toyama takes control of the body of a beautiful girl with his strange invention. He lets the young Asagedani "slip into" her body so he can see how it real feels to be a girl. Then Komaba's classmate, the equally beautiful Nakano, surprises "him" and mistakes his activities for a sexual advance from her friend.
The Armed Virus plagues a small percent of the female population, turning girls into living weapons that are activated with a special...touch. Afraid of the power they hold, these girls are sent to islands where they either survive or die trying. Mamori Tokonome is sent to Mermaid Island and thrust into a world where she is paired up with the mysterious and buxom beauty, Mirei Shikishima. Pressed against a corner, a passionate kiss releases Mamori's power and she becomes a mighty sword that, in Mirei's strong grip, is a fearsome weapon. Together they'll face the Wärter, a group that believes in ruling with a firm hand, who seek the most powerful weapons. Wanting nothing to do with this organization, Mamori and Mirei must find their own way home before the Wärter can claim them for good. The harder they fight, the closer they grow-can Mamori handle when the battle and feelings heat up.
Amidst the chaos of the times, a new generation of warriors will assert themselves and bare their naked fury in open rebellion! Queen Claudette holds all the cards, however, with her Amazonian ranks ready and waiting to meet the rebels in open combat. But the incredible wits and assets of the dazzling array of daring damsels willing to risk their gorgeous skins and put their lithesome bodies on line against her, might just expose a few unexpected weaknesses in the queen’s support!