What do you suggest if my partner doesn't ejaculate when making love?

Possibly meds: You are only 31.You did not mention your partner's age.If he is in the age group for enlarged prostate,is he taking medication such as flomax(tamsulosin)?One of the side effects is called retrograde ejaculation.This means he actually does ejaculate but the semen backs into the bladder instead of going out.It comes out mixed in his urine.Other medicines in the same group can do this.Hope this helps