You may have heard that missionary is the best position to get pregnant, or that you should keep your hips elevated after sex. Wrong. Whether you're on top, your guy is on top, or you're doing a crazy new position you read about, the result is the same. "When a man ejaculates, sperm swims out, goes directly into the cervical. Total sperm count among the same group also tumbled each year for a total decline of percent over the nearly year period. And while this paper offers the most data yet on a subject of lengthy debate, it is far from settled, as the cause and the impact on fertility — and whether it has any real-life. The purpose of this paper is to model the relation between different patterns of sexual intercourse (including both frequency and timing of intercourse) and 28), the timing of ovulation and intercourse within the cycle (29, 30), semen quality (31), cervical mucus characteristics (32, 33), and hormones (34).