What does “soften the noodle” mean in Bad Santa 2?

Question

What does this expression mean in Bad Santa 2 Movie?

Sunny Soke: Of course, it's harder for the girl because she's gotta get off before the drugs soften the noodle.

Answer 1

A little context:

I think she roofied me.
Ah, rohypnol. Excellent icebreaker. Of course, it's harder for the girl because she's gotta get off
- before the drugs soften the noodle.
- Yeah.
(It's not clear how the speeches are distributed, but that's not relevant here.)

Rohypnol ("roofie") is the "date rape" drug, a tranquillizer employed illegally to render the victim incapable of resisting sexual assault and often to induce retrograde amnesia in the victim.

The speaker crassly observes that when a woman administers rohypnol to a man she must act quickly to achieve sexual satisfaction ("get off") before the drug makes him incapable of an erection ("before the drugs soften the noodle").