If a mammal species evolved without the ability for the penis to become erect, what direct impact might this have on sexual reproduction?
It would prevent the transfer of sperms
In mammals that reproduce by internal fertilisation, erection of the penis is essential for intromission, which is how sperms are deposited into the female reproductive tract near the ovum.
If this capacity were absent, direct transfer of sperms from male to female would be prevented, so successful internal fertilisation could not occur. Erection has no direct bearing on the maturation of female organs, the length of pregnancy or breastfeeding, so those options do not describe a direct impact on sexual reproduction.
Hence, It would prevent the transfer of sperms.
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