Yes, keeping a mobile device in the front trouser pocket can negatively affect sperm quality. Several studies have found an association between mobile phone use and reduced sperm motility, viability, and increased DNA fragmentation. The main reasons are:
Electromagnetic radiation (EMR) emitted by mobile phones, especially when in talk mode, can damage sperm DNA and reduce motility.
The heat generated by mobile phones kept close to the testes can raise scrotal temperature, which is detrimental to sperm production and quality.
When mobile phones are kept near metal objects like zippers or keys, the radiation absorption in the testes approximately doubles, further increasing the harmful effects.
Studies have found significantly more DNA fragmentation in sperm exposed to mobile phone radiation, even within an hour of exposure.
Long-term exposure to mobile phone EMR has been linked to decreased sperm concentration, motility, viability, and increased oxidative stress.
While some studies have conflicting results, the weight of evidence suggests keeping an active mobile phone away from the groin area, especially for extended periods, may help maintain optimal sperm quality and male fertility.