My husbands friends always send him porn and prostitute pictures

Mummies, maybe you can relate to this, maybe you can’t... but I just need to let this out. Recently, my husband’s browser had porn and prostitutes in it and when I ask him about it, he claims his friends send the link to him through WhatsApp. The first incident happened about 2 years ago. When confronted, he said he doesn’t look at such stuff. Never saw it again till recently I saw the prostitute one. My argument to him is hat I feel like he should respect our relationship enough not to look at such things. What do you think, mummies?