It is named after the 'Texas Ranger' star, which has 5 points, with a nodule at each point. Traditionally a Texas Star will be one woman and five men, but other gender combinations are considered valid as well.
Other combinations are also considered valid texas stars, sometimes with a male at the center having sex, oral anal or vaginal, while he is being penetrated anally. The only consistant factor is that traditionally there are 5-6 people in simultaneous intercourse with one person.
Texas stars are common in pornographic movies, and are often used to depict gang bangsor ecci encounters.
"(Oh, of course, twin-except that Joe let them watch every brush stroke, once Gigi was sure you didn't mind. Say, Joan,
Gigi would go for a Texas Star with Anton and Fred, I feel certain. And Joe
would go along; he likes them. What do you think? Easy way to keep your
promise to them, huh?)"