you are wise to be concerned but take it one step further. insist that your boyfriend use a condom so that you are not exposed to any of his bodily fluids during sexual activity; oral or otherwise. oral sex is often a gateway activity to other more-risky sexual acts so set the parameters now. no condom no sex play. were you not aware that humans lie or omit the "whole truth"? while your boyfriend may be one of those rare young men who has honestly disclosed his past sexual activity do you think he would automatically disclose a one-night stand with someone else while you are dating? be wise! your risk may be minimal now but stds can be transmitted orally without ejaculation.
is pre cum enough to catch something? . i'm a virgin but recently i've engaged in oral sex for the first time with my boy friend. i was not fond of it so i stopped long before he's ejaculated so nothing went in my mouth aside from some pre-cum. i am very anxious though and was wondering if that was enough to catch anything? hiv std etc? he's only had sex with one other female who was a virgin at that time and so was he. he's received oral from another female as well. based off of those two factors i believe he's clean as well.