Astroglide is a nice last chance backup just in case a condom fails. It has been shown to damage sperm.
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Can I use Astroglide while trying to conceive?
Astroglide is not a spermicide and will not kill sperm. Studies have shown, however, that Astroglide as well as other topical lubricants do inhibit the motility or movement of sperm. Knowing this, if you choose to use Astroglide, we suggest using a small amount applied to the outer area. Discontinue use if conception is not achieved in a reasonable amount of time. It is always advised to consult your physician first and to follow his or her recommendation.
From -
http://www.astroglide.com/products_qa.asp
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Vaginal Lubricants May Harm Sperm
In the study, researchers compared the effects of combining donor sperm from 13 different men in a solution of 10% of each of the four different vaginal lubricants vs. untreated sperm.
The results showed that sperm activity ranged from a high of 66% in untreated sperm to a low of 2% in a solution containing Astroglide.
From -
http://www.webmd.com/infertility-and...y-damage-sperm