The biology of conception · 3-minute read

6 reasons the twoplus Applicator supports your fertility journey

Conception is a numbers game, and the course is tougher than most couples realise. Here's what actually happens to sperm on the way to the cervix, and how the twoplus Applicator's Soft Tip helps keep more of them close to it.

TL;DR
  • Most sperm never get close to the cervix.
  • The twoplus Applicator's Soft Tip keeps more of them close to it, and loses less to leakage.
  • At home, about 15 minutes, no hormones. A lower-cost step to try before IVF or IUI.
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A couple holding the twoplus Applicator
✔ CE/UKCA certified ✔ FDA-cleared ✔ Reviewed by OB-GYNs & fertility specialists ✔ Designed by a Stanford-trained engineer
01

Sperm counts have roughly halved in 40 years

Across studies, average sperm concentration in many regions has fallen by more than 50% since the 1970s, so fewer sperm set out, and fewer survive each stage that follows. The more healthy sperm you can keep close to the cervix, the more stay in the running.[1]

Declining sperm-count visual
02

It skips the most hostile stretch of the journey

Instead of leaving sperm at the vaginal opening, the Applicator places them close to the cervix, so they spend less time in the acidic vaginal tract that can weaken them before they reach the gateway.[2]

Anatomical model with the vaginal canal labelled 'Acidic'
The acidic vaginal tract the Applicator helps sperm skip. Illustration, not to anatomical scale.
03

The Sperm Cradle holds sperm right where it counts

The Soft Tip acts as a gentle stopper. Rather than letting semen disperse and drain away, the Sperm Cradle concentrates and holds it at the cervical opening, so more sperm stays close to the cervix, in contact with the cervical mucus.

Close-up macro of the twoplus Soft Tip, the Sperm Cradle
The Soft Tip, up close, the heart of the Sperm Cradle.
04

It loses less to leakage

A large share of semen simply flows back out during and after intercourse. By cradling it near the cervix, the Applicator reduces that leakage, keeping more of what matters close to the gateway, for longer.[3]

Ordinary syringe lets sperm flow back; the twoplus Soft Tip holds sperm at the cervix
Ordinary syringe vs. the twoplus Soft Tip. Illustration, not to anatomical scale.
05

It works with your body's natural filter, not around it

We deliberately stopped at the cervix. The Applicator delivers sperm close to the cervix and then gets out of the way. Your cervical mucus still filters sperm naturally, letting the healthy, motile ones through, exactly as it would otherwise.[4] The Applicator's job is the start line. The rest is nature.

The Applicator delivers sperm near the cervix; cervical mucus filters the healthiest through
The Applicator's job: deliver sperm near the cervix. The rest is nature. Illustration, not to anatomical scale.
06

It takes more than one sperm

Only one sperm fertilises the egg, but it can't get there alone. Sperm work as a pack to break through the egg's outer layer, so the more healthy sperm that arrive, the better the odds for the one that counts.[5]

Many sperm around an egg

An honest note: it isn't right for everyone. If you don't ovulate, have blocked tubes, or your partner has no sperm, see a fertility specialist. The Applicator is a step to try before or alongside IVF or IUI, not a replacement for them or for medical advice.

Get up to 47% off the Applicator A lower-cost option to consider before, or alongside, IUI or IVF.

Give more sperm a head start

The twoplus Applicator places sperm close to the cervix, cradles them there with the Soft Tip, loses less to leakage, and then lets your body do the choosing, built around the biology of conception.

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  • ✔ Single-use · about 15 minutes · no doctor needed
  • ✔ Discreet delivery
  • ✔ CE/UKCA certified · FDA-cleared
From couples who've used it

Real experiences, in their words

Genuine stories from couples across the UK who tried the Applicator.

Shared with permission. Individual results vary.

twoplus founder
Why we built it

Designed by someone who lived the problem

The Applicator was designed by a Stanford-trained biomedical engineer who went through years of fertility challenges himself. After he and his wife spent five years trying to conceive, including multiple rounds of IVF, he set out to build a simpler, lower-cost option couples could try at home, grounded in how conception actually works. twoplus is Singapore-founded and science-led.

Simple by design
3 simple steps: collect the sample, draw into the Applicator, place near the cervix — 15 minutes, at home, no hormones.

No clinic, no appointment, no timed-sex pressure.

References

The science below is sourced to peer-reviewed literature (per twoplus compliance, Section 9). twoplus's own product testing is held on file, and internal company figures (e.g. units sold) are company data.

  1. Sperm counts have roughly halved in 40 years. Levine H, et al. Temporal trends in sperm count: a systematic review and meta-regression analysis. Human Reproduction Update. 2017;23(6):646–659 — total sperm count fell 59.3% among unselected Western men, 1973–2011. academic.oup.com
  2. The vagina is acidic and hostile to sperm. Nakano FY, Leão RBF, Esteves SC. Insights into the role of cervical mucus and vaginal pH in unexplained infertility. MedicalExpress (São Paulo). 2015;2(2):M150207 — vaginal pH ~3.8–4.5 is toxic to sperm; optimal sperm-viability pH is 7.0–8.5. scielo.br
  3. Most sperm are lost to leakage at the vaginal level. Nakano FY, et al. 2015 (as above) — the majority of sperm are expelled from the vagina in the flow-back of semen shortly after intercourse.
  4. Cervical mucus filters sperm. Nakano FY, et al. 2015 (as above); GLOWM, Sperm Transport and Capacitation (ch. 45) — cervical mucus selectively admits morphologically normal, motile sperm.
  5. It takes more than one sperm. Ikawa M, Inoue N, Benham AM, Okabe M. Fertilization: a sperm's journey to and interaction with the oocyte. J Clin Invest. 2010;120(4):984–994. jci.org

The twoplus Applicator is an at-home intravaginal insemination (ICI) device — CE/UKCA certified and FDA-cleared (510(k) K232579). It is produced in a clean room and is single-use; it is not sterile in the clinical sense. It is not a treatment or cure for infertility, and it is not a substitute for professional medical advice, IUI or IVF. Individual experiences vary. If you have any concerns about your fertility, please speak to your doctor. © 2026 twoplus Fertility.