Actually, assuming that one sperm does in fact contain 37.5 MB of data, and that a typical ejaculation lasts three seconds and contains approximately 50,000,000 sperm cells...

50,000,000 in one ejaculation x 37.5 MB = 1,875,000,000 megabytes.

1,875,000,000 MB = 1,875,000 GB = 1,875 TB = 1.875 PB per ejaculation.

For comparison, that equates to about 320 Wikipedias, 8% of Google's daily data usage, or about 10% of AT&T's daily data usage.

Source for average load size