The best replacement for sperm is cm.

The best alternatives to sperm are rated as following:
★★★★★  cm
★★★★★  mucus plug
★★★★  egg cells are
★★★★  seaman
★★★★  discharge
★★★  cervical mucus
★★★  egg white cervical mucus
★★★  ewcm
★★  amniotic fluid
★★  egg size
★  water breaking
★  egg donation
★  cervical fluid
★  egg
★  semen
★  spermatozoa
★  cervidil
★  egg cell
  mucus
  female

Your alternative for sperm is not listed? Suggest!
Speaking about sperm, one probably shouldn't forget about blood.

Other search terms related to sperm and their ratings are:
★★★★★ blood
★★★ seminal fluid
ovum
You have in mind a companion for sperm and it is not yet here? Propose!



Google Trends

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sperm
cm
mucus plug