Do spermatozoa penetrate through the tissue?
If we answer this question solely from the point of view of the theory, then this is possible. As you know, sperm are very small, and, in principle, can penetrate through clothing. However, in practice this is impossible.
The thing is that for this it is necessary that the fabric is completely wet, as from rain, for example. This in principle can not be, because during the ejaculation of seminal fluid only 2-5 ml is released. However, at the same time it is worth considering that if the sperm was on the underwear, which has lace, a reticulum, then there is a possibility of its penetration into the genital organs.
If we talk about whether it is possible to get pregnant from petting (touching the erogenous zones) through clothes, then it is worth saying that the probability of conception with this form of intimate communication is very small.
Can I get pregnant through clothes and pads?
The fact is that for the movement and activity of male sex cells, a moist environment is needed, in the absence of which they quickly die and are simply unable to move. In addition, even if we assume that spermatozoa managed to penetrate layers of outerwear and underwear, they will have a sanitary napkin on their way, which completely excludes the possibility of germ cells entering the reproductive system of a woman. Therefore, in such situations, a woman should not worry.