Your are absolutely right, especially because the chipsmayai effect is still barely mentioned in literature.
On their way home from school, girls are often subjected to sexual exploitation. A chips mayai (potatoes omelette) is the most common way used by men to pay them. Hungry, tired and aware of the amount of things they have to do at home girls are likely to accept to follow a man for food and few moments of rest. Consequences are not just pregnancies but HIV transmission, psychological effects, etc... it is mainly caused by financial challenges, leading to the impossibility to buy enough food at school.
Another impact of this effect is the reverse situation: once entered in the perception that what is happening is bringing them some benefits, girls start "selling" themselves to the motorbike drivers to not to pay the ride, to men to buy food for the family, to access those things that are not achievable for who lives below the poverty line.
This is a short version of the proper explanation of the effect but i think it makes it more comprehensible for everyone.