To improve your chances of getting your wife pregnant, you should address both the penis problem and asthenozoospermia. Stress, fear or health issues such as heart disease may cause the penis to malfunction. Asthenozoospermia is when a male’s sperm are not moving well. One might need advice that is tailored to them from a professional on what to do which could involve; talking therapy to reduce anxiety levels, drugs that can help one get an erection, or changing how they live intending to improve their sperm health among others. A sexologist should be consulted for more information on this subject.