This would make Thomas Homo-flexible
Homoflexibility is related to, but different from bisexuality in that homoflexible persons most often identify as gay or lesbian, despite occasional relations with members of the opposite sex. The term may sometimes be appropriate as a synonym for bi-curious, where the individual in question is primarily homosexual.
The term "heteroflexible" was first developed to describe primarily heterosexual persons who occasionally enjoyed hooking up with members of the same sex. "Homoflexible" later began to be used as a parallel term as defined above.
Straight Boy: "Wait a minute, aren't you gay."
Gay Boy: "I'm homoflexible, dude. Making out with girls is fun! Just don't tell my boyfriend..."
Usually, just a phase.