What should I do Guys?

So basically there are intrusive thoughts which are sexual in nature and they are like so much intense that they lead to real arousal which means pre seminal fluid in result. I am so tired and I am so scared what should I do? So my clothes get dirty because of this fluid and I am also scared that this might lead to ejaculation or discharge of semen so I don't know how to get rid of this because the more I try to suppress the more it get stronger so I know the pattern that I don't have to suppress it but even if I don't suppress it if I leave it as it is but the thoughts will take over my mind or maybe so much intense that if I close my eyes I am going to you know thoughts which are BDSM in nature yeah I know that these thoughts are like sexual intrusive OCD thoughts but I am done fighting with them I feel like I am gonna ejaculate plus I experience frequent nightfall like in a week or in a 2 weeks I experience one nightfall and everyday go to sleep it's like you know fear in my mind let what is I know some how and it up getting nightfall and the bed will be dirty so my mom will be so much angry on me but this is not the real problem real problem is contamination ocd which takes place here. So am cooked. Any advice will be appreciated. Only mens please.