I am arguing that holistically, being homosexual is something out of an agents control.
Holistic: dealing with or treating the whole of something or someone and not just a part (cambridge dictionary)
Your claim, therefore, being homosexual is ALWAYS out of the agent's control.
I found two real-life examples of homosexuality being a choice. There's hundreds more out there, such as:
In fact psychologists themselves have documented that it is perfectly normal for sexual orientation to change over time:
According to psychologist Dr. Jennelle in the YourTango Expert video above, sexual identity is more than just being 100 percent gay or 100 percent straight. Rather, sexual identity is dimensional and constantly changing, and there are several places you can fall along the spectrum.
And yes, your positioning on the spectrum can change in radical ways over time.
Moreover:
In her book, Sexual Fluidity, psychology professor Lisa M. Diamond researched 80 non-heterosexual women over a 10 year period. She discovered that many of these women reported falling in love with a member of the opposite sex, despite their previous lesbian sexual orientation.
Same source as above.
People change their sexual orientation all the time. It's a fact of life. Your views are out of date with science and not based in reality.