Normal oral sex is not quite the same as the feeling of intra-vaginal intercourse, and it is normal that the first time being oral may be shorter due to the glans being too sensitive or too excited. Usually, short oral sex time is not premature ejaculation, if there is regular intravaginal sex, and ejaculation time is often less than 2 minutes or more, unable to control ejaculation, causing a certain amount of distress to both sides, this situation is considered premature ejaculation. Therefore, there is no need to worry too much, as long as intravaginal sex is normal and does not affect the sexual experience of both parties, it is generally not a big problem.