宫颈黏液法（比林斯法）
近年来，安全期避孕的另一种方式已经有了一定程度的流行，称为“宫颈黏液法”或“比林斯法”(以其倡议者约翰和伊夫琳·比林斯的名字命名，为两个澳大利亚妇科医生)。该避孕方法根据对子宫颈黏液栓的观察来判断是否排卵。通常，黏液栓为不透明黏糊状，可以阻止精子穿透；在排卵期，黏液栓变得清亮、粘滑、稀薄和更丰沛。一旦发生这样的改变，黏液拴可以更容易被精子穿透，并且用两个手指蘸上少许，它能伸展成长长的黏液丝。医生把它称之为“拉丝”("Spinnbarkeit"， 在德国为 “spinnability”)。这个测试加之保存下来的自我细致的观察记录，因而可以显示女子在什么时候已经发生过排卵。随着时间的推移，所积累下来的黏液栓性状改变的信息能够用于预测受精期或“不安全”期，以避免在此期发生性交。如果没有进一步指导和专业督察，这种方法确实对避孕还帮助不大。虽然如此，它仍然有一定的价值，并由此与“基础体温法”合并运用。安全期避孕的全部三种方法有其自身的缺陷，然而，不管如何，合并运用则会增大避孕的保险系数。
避孕效果：不太有效。

宫颈黏液的变化：1.月经后不久：无黏液；2.排卵前不久：液化的黏液；3.排卵期：黏液在两个手指之间能伸展成细细的拉丝(“Spinnbarkeit”)。
Changes in the cervical mucus: 1. Shortly after menstruation: no mucus. 2. Shortly before ovulation: liquifying mucus. 3. Ovulation: mucus can be stretched into a thin thread between two fingers ("Spinnbarkeit").
Credit: Etschenberg, K. and A. Pommerenke: Empfängnisregelung: Materialangebote für Schulen, Seelze, 2000 

Contraception

Methods of Contraception: Contraceptive Methods for Women：“Rhythm”

Billings Method
In recent years, another version of the rhythm method has gained some wider currency. Known as the "mucus method" or "Billings method" (after its original proponents, John and Evelyn Billings, two Australian gynecologists), it is based on the observation that the normally cloudy cervical mucus blocking the sperm becomes clear, slippery, wet and more profuse during ovulation. In this condition the mucus can more easily be penetrated by sperm cells, and, taking a sample between two fingers, it can be stretched into a long thread. Doctors call this phenomenon "Spinnbarkeit" (German for “spinnability”). This test plus careful record keeping and self-observation can therefore tell a woman when ovulation has occurred. The accumulated information can, over time, be used to predict the fertile, "unsafe" days on which coitus is to be avoided. This method cannot really be helpful without extensive instruction and professional supervision. Even so, it remains of limited value and is therefore often combined with the "basal temperature method." All three versions of the rhythm method have their drawbacks, however, no matter how they are used in combination.
Effectiveness: not very effective