Admittedly, a homosexual can be conditioned to react sexually to a woman, or to an old boot for that matter. In fact, both homo - and heterosexual experimental subjects have been conditioned to react sexually to an old boot, and you can save a lot of money that way.

Summary

This quote seems to sarcastically suggest that both homosexual and heterosexual individuals can be conditioned to feel sexual attraction towards objects or individuals of any gender. The mention of conditioning individuals to be attracted to an "old boot" is meant to highlight the absurdity of attempting to change someone's sexual orientation through conditioning. Moreover, the mention of saving money serves as a dark humor element, implying that attempting such conditioning would be a pointless and wasteful endeavor.