如何使用避孕套（另见：正确使用安全套）
如果使用得当，避孕套是非常有效的避孕手段。在性交之前（不是在恰好要射精之前），就必须给勃起的阴茎戴上避孕套。在戴上了避孕套的阴茎顶端，有一个小间隙（蓄精囊）肯定会留存下来，它是为了收集预期而至的精液的。可是，在这个小间隙或“安全空间”里的任何空气必须先期压挤出去，为的是防止气泡导致阴茎头疼痛。射精以后，男方在其阴茎松软之前，必须立即抽离其阴茎，握住避孕套开口，以免它滑脱。戴好了避孕套后，再在避孕套外抹上一些杀精子乳膏或乳剂，避孕有效率会进一步提高。

1.从包装里取出避孕套。2.把避孕套戴到勃起的阴茎顶端。3.挤出气囊内空气并把套子向下卷到阴茎根部。
1.Taking the condom from the package. 2.Putting the condom on top of the erect penis.3.Pressing the air out of the reservoir and rolling the condom down to the bottom of the penis shaft.
Credit: Etschenberg, K. and A. Pommerenke: Empfängnisregelung: Materialangebote für Schulen, Seelze, 2000. 

Contraception

Methods of Contraception: Contraceptive Methods for Men

How to use it
The condom is a very effective contraceptive if used properly. It must be put on the erect penis before coitus (not just before ejaculation). At the tip of the penis, some space (a reservoir) has to be left to accommodate the expected semen, otherwise the condom may burst. However, any air in this reservoir or “safety space” must be pressed out first in order to prevent an air bubble that could cause some pain to the glans. Immediately after ejaculation, the man must withdraw his penis before losing his erection, holding on to the condom at its base so that it cannot slip off. The effectiveness ran be increased still further by putting some spermicidal cream or jelly on the outside of the condom after it is in place on the penis, or by having the woman use spermicidal foam at the same time.