meaning of "condensation"
Does "condensation" in this context mean "increase"?

Context: In the first volume of his planned four-volume study The History of Sexuality (1976), Michel Foucault observed a “sudden, radical condensation of sexual categories” in the West, beginning in the late nineteenth century. This meant there appeared to be a new intellectual concern, across several fields of knowledge, with distinguishing heterosexual from other sexual behaviors such as homosexuality (Art and Politics by Claudia Mesch).

Question

meaning of  "condensation"
Does "condensation" in this context mean "increase"?

Context: In the first volume of his planned four-volume study The History of Sexuality (1976), Michel Foucault observed a “sudden, radical condensation of sexual categories” in the West, beginning in the late nineteenth century. This meant there appeared to be a new intellectual concern, across several fields of knowledge, with distinguishing heterosexual from other sexual behaviors such as homosexuality (Art and Politics by Claudia Mesch).

Answer

No, if anything it's completely the opposite. When you condense something down, it means to simplify, and reduce. 
I think it is referring to the previous focus on a plethora of various sexual preferences being reduced down to simply homo- versus hetero-sexuality.

Answer

In this case "commendation" in "sudden, radical condensation of sexual categories" most closely means "to condense". Your assumption that it meant "to increase" is very close to this.