- We found semen, but I can't identify it.
- What do you mean?
- Aspermia.

7 seconds sound clip from the Cruising movie soundboard.

You can hear this line at 00:12:46 in the Blu-ray version of the movie.

Quote context

[...]

- What are you gonna do?

- I know what I have to do.

- I don't wanna make this too tight for you.

- Please. Please. Please. Please.

- You made me do that.

- Anus was dilated at the time of death, slight rupture above the anus indicating intercourse.

- We found semen, but I can't identify it.

- What do you mean?

- Aspermia.

- In English.

- No sperm. Your killer's shooting blanks. His semen tested positively, but it doesn't have any sperm in it.

- Why not?

- Well, maybe he has some physical aberration or a malfunction.

- Could be his testes are infected, maybe he had a vasectomy.

[...]